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+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8584b8f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "bibiman"
+version = "0.1.0"
+authors = ["lukeflo <lukeflo@some.email.not>"]
+license = "GPL-3.0-or-later"
+edition = "2021"
+
+[dependencies]
+biblatex = "0.9.3"
+crossterm = { version = "0.28.1", features = ["event-stream"] }
+futures = "0.3.30"
+ratatui = "0.28.1"
+regex = "1.10.6"
+sarge = "7.2.5"
+tokio = { version = "1.39.3", features = ["full"] }
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1c22348
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+# Bibiman
diff --git a/plainfile b/plainfile
new file mode 100644
index 0000000..78481bb
--- /dev/null
+++ b/plainfile
@@ -0,0 +1,3 @@
+My first entry
+A second entry
+And a third one
diff --git a/src/backend.rs b/src/backend.rs
new file mode 100644
index 0000000..7907145
--- /dev/null
+++ b/src/backend.rs
@@ -0,0 +1,2 @@
+pub mod bib;
+pub mod cliargs;
diff --git a/src/backend/bib.rs b/src/backend/bib.rs
new file mode 100644
index 0000000..aa7272f
--- /dev/null
+++ b/src/backend/bib.rs
@@ -0,0 +1,51 @@
+use biblatex::Bibliography;
+use regex::Regex;
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+use super::cliargs::{CLIArgs, PosArgs};
+
+// Set necessary fields
+// TODO: can surely be made more efficient/simpler
+pub struct Bibi {
+    pub citekeys: Vec<String>,
+    // pub bibliography: Bibliography,
+}
+
+pub fn get_bibfile(filename: impl AsRef<Path>) -> String {
+    let bibfile = fs::read_to_string(&filename).unwrap();
+    bibfile
+}
+
+pub fn get_citekeys(bibstring: &Bibliography) -> Vec<String> {
+    // let bib = Bibliography::parse(&get_bibfile(CLIArgs::parse_cli_args().bibfilearg)).unwrap();
+    // // Define Regex to match citekeys
+    // let re = Regex::new(r"(?m)^\@[a-zA-Z]*\{(.*)\,").unwrap();
+    // // Declare empty vector to fill with captured keys
+    // // Has to be Vec<&str> because of captures_iter method
+    // let mut keys = vec![];
+    // for (_, [key]) in re.captures_iter(&bibfilestring).map(|c| c.extract()) {
+    //     keys.push(key);
+    // }
+    // // Transform Vec<&str> to Vec<String> which is needed by the struct Bibi
+    // let mut citekeys: Vec<String> = keys.into_iter().map(String::from).collect();
+    // // Sort vector items case-insensitive
+    // citekeys.sort_by_key(|name| name.to_lowercase());
+    // citekeys
+    let mut citekeys: Vec<String> = bibstring.iter().map(|entry| entry.to_owned().key).collect();
+    citekeys.sort_by_key(|name| name.to_lowercase());
+    citekeys
+}
+
+impl Bibi {
+    pub fn new() -> Self {
+        // TODO: Needs check for config file path as soon as config file is impl
+        let bib = Bibliography::parse(&get_bibfile(PosArgs::parse_pos_args().bibfilearg)).unwrap();
+        Self {
+            citekeys: get_citekeys(&bib),
+            // bibliography: biblatex::Bibliography::parse(&bibfilestring).unwrap(),
+        }
+    }
+}
diff --git a/src/backend/cliargs.rs b/src/backend/cliargs.rs
new file mode 100644
index 0000000..b820b6a
--- /dev/null
+++ b/src/backend/cliargs.rs
@@ -0,0 +1,89 @@
+use core::panic;
+use std::path::{Path, PathBuf};
+
+use sarge::prelude::*;
+
+sarge! {
+    // Name of the struct
+    ArgumentsCLI,
+
+    // Show help and exit.
+    'h' help: bool,
+
+    // Show version and exit. TODO: Write version...
+    'v' version: bool,
+
+    // Option for file: -b - short option; --bibfile - long option
+    // #ok makes it optional
+    #ok 'b' bibfile: String,
+}
+
+// struct for CLIArgs
+pub struct CLIArgs {
+    pub helparg: bool,
+    pub versionarg: bool,
+}
+
+impl CLIArgs {
+    pub fn parse_cli_args() -> Self {
+        let (cli_args, _) = ArgumentsCLI::parse().expect("Could not parse CLI arguments");
+        Self {
+            helparg: cli_args.help,
+            versionarg: cli_args.version,
+        }
+    }
+}
+
+// Struct for positional arguments
+// TODO: Can surely be improved!!
+pub struct PosArgs {
+    pub bibfilearg: PathBuf,
+}
+
+impl PosArgs {
+    pub fn parse_pos_args() -> Self {
+        let (_, pos_args) = ArgumentsCLI::parse().expect("Could not parse positional arguments");
+        Self {
+            bibfilearg: if pos_args.len() > 1 {
+                PathBuf::from(&pos_args[1])
+                // pos_args[1].to_string()
+            } else {
+                panic!("No path to bibfile provided as argument")
+            }, // bibfilearg: pos_args[1].to_string(),
+        }
+    }
+}
+
+pub fn help_func() -> String {
+    let help = format!(
+        "\
+{} {}
+
+USAGE:
+    bibiman [FLAGS] [file]
+
+POSITIONAL ARGS:
+    <file>    Path to .bib file
+
+FLAGS:
+    -h, --help      Show this help and exit
+    -v, --version   Show the version and exit",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+    );
+    help
+}
+
+pub fn version_func() -> String {
+    let version = format!(
+        "\
+{} {}
+{}
+{}",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+        env!("CARGO_PKG_AUTHORS"),
+        env!("CARGO_PKG_LICENSE")
+    );
+    version
+}
diff --git a/src/frontend.rs b/src/frontend.rs
new file mode 100644
index 0000000..6ec15f2
--- /dev/null
+++ b/src/frontend.rs
@@ -0,0 +1,5 @@
+pub mod app;
+pub mod event;
+pub mod ui;
+pub mod tui;
+pub mod handler;
diff --git a/src/frontend/app.rs b/src/frontend/app.rs
new file mode 100644
index 0000000..ce250cd
--- /dev/null
+++ b/src/frontend/app.rs
@@ -0,0 +1,221 @@
+use crate::backend::bib::*;
+use std::error;
+
+use ratatui::widgets::ListState;
+
+// Application result type.
+pub type AppResult<T> = std::result::Result<T, Box<dyn error::Error>>;
+
+// Areas in which actions are possible
+#[derive(Debug)]
+pub enum CurrentArea {
+    EntryArea,
+    TagArea,
+    // SearchArea,
+}
+
+// Application.
+#[derive(Debug)]
+pub struct App {
+    // Is the application running?
+    pub running: bool,
+    // list
+    pub tag_list: TagList,
+    // TODO: table items
+    pub entry_list: EntryList,
+    // area
+    pub current_area: CurrentArea,
+}
+
+// Define the fundamental List
+#[derive(Debug)]
+pub struct TagList {
+    pub tag_list_items: Vec<TagListItem>,
+    pub tag_list_state: ListState,
+}
+
+// Structure of the list items. Can be a simple string or something more elaborated
+// eg:
+// struct TagListItem {
+//     todo: String,
+//     info: String,
+//     status: Status,
+// }
+// where Status has to be defined explicitly somewhere else
+#[derive(Debug)]
+pub struct TagListItem {
+    pub info: String,
+}
+
+// Function to process inputed characters and convert them (to string, or more complex function)
+impl TagListItem {
+    pub fn new(info: &str) -> Self {
+        Self {
+            info: info.to_string(),
+        }
+    }
+}
+
+// INFO: in the original template it was <&'static str> instead of <String>
+impl FromIterator<String> for TagList {
+    // INFO: Here to originally <&'static str>
+    fn from_iter<I: IntoIterator<Item = String>>(iter: I) -> Self {
+        let tag_list_items = iter
+            .into_iter()
+            // INFO: here originally not borrowed (without Ampersand'&')
+            .map(|info| TagListItem::new(&info))
+            .collect();
+        let tag_list_state = ListState::default(); // for preselection: .with_selected(Some(0));
+        Self {
+            tag_list_items,
+            tag_list_state,
+        }
+    }
+}
+
+impl FromIterator<(String, String)> for EntryList {
+    fn from_iter<T: IntoIterator<Item = (String, String)>>(iter: T) -> Self {
+        let entry_list_items = iter
+            .into_iter()
+            .map(|(authors, title)| EntryListItem::new(&authors, &title))
+            .collect();
+        let entry_list_state = ListState::default();
+        Self {
+            entry_list_items,
+            entry_list_state,
+        }
+    }
+}
+
+// Define list containing entries as table
+#[derive(Debug)]
+pub struct EntryList {
+    pub entry_list_items: Vec<EntryListItem>,
+    pub entry_list_state: ListState,
+}
+
+// Define contents of each entry table row
+#[derive(Debug)]
+pub struct EntryListItem {
+    pub authors: String,
+    pub title: String,
+    // pub year: u16,
+}
+
+impl EntryListItem {
+    pub fn new(authors: &str, title: &str) -> Self {
+        Self {
+            authors: authors.to_string(),
+            title: title.to_string(),
+        }
+    }
+}
+
+impl Default for App {
+    fn default() -> Self {
+        // TEST: read file
+        let lines = Bibi::new().citekeys;
+        let iter = vec![
+            (
+                "Mrs. Doubtfire".to_string(),
+                "A great book of great length".to_string(),
+            ),
+            ("Veye Tatah".to_string(), "Modern economy".to_string()),
+            ("Joseph Conrad".to_string(), "Heart of Darkness".to_string()),
+            (
+                "Michelle-Rolpg Trouillot".to_string(),
+                "Silencing the Past".to_string(),
+            ),
+            ("Zora Neale Hurston".to_string(), "Barracoon".to_string()),
+        ];
+        // let mylist = ["Item 1", "Item 2"];
+        Self {
+            running: true,
+            // INFO: here the function(s) for creating the list has to be placed inside the parantheses -> Bib::whatever
+            tag_list: TagList::from_iter(lines),
+            entry_list: EntryList::from_iter(iter),
+            current_area: CurrentArea::EntryArea,
+        }
+    }
+}
+
+impl App {
+    // Constructs a new instance of [`App`].
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    // Handles the tick event of the terminal.
+    pub fn tick(&self) {}
+
+    // Set running to false to quit the application.
+    pub fn quit(&mut self) {
+        self.running = false;
+    }
+
+    // Toggle moveable list between entries and tags
+    pub fn toggle_area(&mut self) {
+        match self.current_area {
+            CurrentArea::EntryArea => self.current_area = CurrentArea::TagArea,
+            CurrentArea::TagArea => self.current_area = CurrentArea::EntryArea,
+        }
+    }
+
+    pub fn select_none(&mut self) {
+        match self.current_area {
+            CurrentArea::EntryArea => self.entry_list.entry_list_state.select(None),
+            CurrentArea::TagArea => self.tag_list.tag_list_state.select(None),
+        }
+        // self.tag_list.tag_list_state.select(None);
+    }
+
+    pub fn select_next(&mut self) {
+        match self.current_area {
+            CurrentArea::EntryArea => self.entry_list.entry_list_state.select_next(),
+            CurrentArea::TagArea => self.tag_list.tag_list_state.select_next(),
+        }
+        // self.tag_list.tag_list_state.select_next();
+    }
+    pub fn select_previous(&mut self) {
+        match self.current_area {
+            CurrentArea::EntryArea => self.entry_list.entry_list_state.select_previous(),
+            CurrentArea::TagArea => self.tag_list.tag_list_state.select_previous(),
+        }
+        // self.tag_list.tag_list_state.select_previous();
+    }
+
+    pub fn select_first(&mut self) {
+        match self.current_area {
+            CurrentArea::EntryArea => self.entry_list.entry_list_state.select_first(),
+            CurrentArea::TagArea => self.tag_list.tag_list_state.select_first(),
+        }
+        // self.tag_list.tag_list_state.select_first();
+    }
+
+    pub fn select_last(&mut self) {
+        match self.current_area {
+            CurrentArea::EntryArea => self.entry_list.entry_list_state.select_last(),
+            CurrentArea::TagArea => self.tag_list.tag_list_state.select_last(),
+        }
+        // self.tag_list.tag_list_state.select_last();
+    }
+
+    // pub fn select_none(&mut self) {
+    //     self.entry_list.entry_list_state.select(None);
+    // }
+
+    // pub fn select_next(&mut self) {
+    //     self.entry_list.entry_list_state.select_next();
+    // }
+    // pub fn select_previous(&mut self) {
+    //     self.entry_list.entry_list_state.select_previous();
+    // }
+
+    // pub fn select_first(&mut self) {
+    //     self.entry_list.entry_list_state.select_first();
+    // }
+
+    // pub fn select_last(&mut self) {
+    //     self.entry_list.entry_list_state.select_last();
+    // }
+}
diff --git a/src/frontend/event.rs b/src/frontend/event.rs
new file mode 100644
index 0000000..f83dfea
--- /dev/null
+++ b/src/frontend/event.rs
@@ -0,0 +1,97 @@
+use std::time::Duration;
+
+use crossterm::event::{Event as CrosstermEvent, KeyEvent, MouseEvent};
+use futures::{FutureExt, StreamExt};
+use tokio::sync::mpsc;
+
+use crate::frontend::app::AppResult;
+
+/// Terminal events.
+#[derive(Clone, Copy, Debug)]
+pub enum Event {
+    /// Terminal tick.
+    Tick,
+    /// Key press.
+    Key(KeyEvent),
+    /// Mouse click/scroll.
+    Mouse(MouseEvent),
+    /// Terminal resize.
+    Resize(u16, u16),
+}
+
+/// Terminal event handler.
+#[allow(dead_code)]
+#[derive(Debug)]
+pub struct EventHandler {
+    /// Event sender channel.
+    sender: mpsc::UnboundedSender<Event>,
+    /// Event receiver channel.
+    receiver: mpsc::UnboundedReceiver<Event>,
+    /// Event handler thread.
+    handler: tokio::task::JoinHandle<()>,
+}
+
+impl EventHandler {
+    /// Constructs a new instance of [`EventHandler`].
+    pub fn new(tick_rate: u64) -> Self {
+        let tick_rate = Duration::from_millis(tick_rate);
+        let (sender, receiver) = mpsc::unbounded_channel();
+        let _sender = sender.clone();
+        let handler = tokio::spawn(async move {
+            let mut reader = crossterm::event::EventStream::new();
+            let mut tick = tokio::time::interval(tick_rate);
+            loop {
+                let tick_delay = tick.tick();
+                let crossterm_event = reader.next().fuse();
+                tokio::select! {
+                  _ = _sender.closed() => {
+                    break;
+                  }
+                  _ = tick_delay => {
+                    _sender.send(Event::Tick).unwrap();
+                  }
+                  Some(Ok(evt)) = crossterm_event => {
+                    match evt {
+                      CrosstermEvent::Key(key) => {
+                        if key.kind == crossterm::event::KeyEventKind::Press {
+                          _sender.send(Event::Key(key)).unwrap();
+                        }
+                      },
+                      CrosstermEvent::Mouse(mouse) => {
+                        _sender.send(Event::Mouse(mouse)).unwrap();
+                      },
+                      CrosstermEvent::Resize(x, y) => {
+                        _sender.send(Event::Resize(x, y)).unwrap();
+                      },
+                      CrosstermEvent::FocusLost => {
+                      },
+                      CrosstermEvent::FocusGained => {
+                      },
+                      CrosstermEvent::Paste(_) => {
+                      },
+                    }
+                  }
+                };
+            }
+        });
+        Self {
+            sender,
+            receiver,
+            handler,
+        }
+    }
+
+    /// Receive the next event from the handler thread.
+    ///
+    /// This function will always block the current thread if
+    /// there is no data available and it's possible for more data to be sent.
+    pub async fn next(&mut self) -> AppResult<Event> {
+        self.receiver
+            .recv()
+            .await
+            .ok_or(Box::new(std::io::Error::new(
+                std::io::ErrorKind::Other,
+                "This is an IO error",
+            )))
+    }
+}
diff --git a/src/frontend/handler.rs b/src/frontend/handler.rs
new file mode 100644
index 0000000..2cc8bb5
--- /dev/null
+++ b/src/frontend/handler.rs
@@ -0,0 +1,70 @@
+use crate::frontend::app::{App, AppResult};
+use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+
+use super::app::CurrentArea;
+
+/// Handles the key events and updates the state of [`App`].
+pub fn handle_key_events(key_event: KeyEvent, app: &mut App) -> AppResult<()> {
+    // Keycodes activated for every area (high priority)
+    match key_event.code {
+        // Exit application on `ESC` or `q`
+        KeyCode::Esc | KeyCode::Char('q') => {
+            app.quit();
+        }
+        // Exit application on `Ctrl-C`
+        KeyCode::Char('c') | KeyCode::Char('C') => {
+            if key_event.modifiers == KeyModifiers::CONTROL {
+                app.quit();
+            }
+        }
+        _ => {}
+    }
+    // Keycodes for specific areas
+    match app.current_area {
+        // Keycodes for the tag area
+        CurrentArea::TagArea => match key_event.code {
+            KeyCode::Char('j') | KeyCode::Down => {
+                app.select_next();
+            }
+            KeyCode::Char('k') | KeyCode::Up => {
+                app.select_previous();
+            }
+            KeyCode::Char('h') | KeyCode::Left => {
+                app.select_none();
+            }
+            KeyCode::Char('g') | KeyCode::Home => {
+                app.select_first();
+            }
+            KeyCode::Char('G') | KeyCode::End => {
+                app.select_last();
+            }
+            KeyCode::Tab | KeyCode::BackTab => {
+                app.toggle_area();
+            }
+            _ => {}
+        },
+        // Keycodes for the entry area
+        CurrentArea::EntryArea => match key_event.code {
+            KeyCode::Char('j') | KeyCode::Down => {
+                app.select_next();
+            }
+            KeyCode::Char('k') | KeyCode::Up => {
+                app.select_previous();
+            }
+            KeyCode::Char('h') | KeyCode::Left => {
+                app.select_none();
+            }
+            KeyCode::Char('g') | KeyCode::Home => {
+                app.select_first();
+            }
+            KeyCode::Char('G') | KeyCode::End => {
+                app.select_last();
+            }
+            KeyCode::Tab | KeyCode::BackTab => {
+                app.toggle_area();
+            }
+            _ => {}
+        },
+    }
+    Ok(())
+}
diff --git a/src/frontend/tui.rs b/src/frontend/tui.rs
new file mode 100644
index 0000000..94db9ea
--- /dev/null
+++ b/src/frontend/tui.rs
@@ -0,0 +1,77 @@
+use crate::frontend::app::{App, AppResult};
+use crate::frontend::event::EventHandler;
+use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
+use crossterm::terminal::{self, EnterAlternateScreen, LeaveAlternateScreen};
+use ratatui::backend::Backend;
+use ratatui::Terminal;
+use std::io;
+use std::panic;
+
+/// Representation of a terminal user interface.
+///
+/// It is responsible for setting up the terminal,
+/// initializing the interface and handling the draw events.
+#[derive(Debug)]
+pub struct Tui<B: Backend> {
+    /// Interface to the Terminal.
+    terminal: Terminal<B>,
+    /// Terminal event handler.
+    pub events: EventHandler,
+}
+
+impl<B: Backend> Tui<B> {
+    /// Constructs a new instance of [`Tui`].
+    pub fn new(terminal: Terminal<B>, events: EventHandler) -> Self {
+        Self { terminal, events }
+    }
+
+    /// Initializes the terminal interface.
+    ///
+    /// It enables the raw mode and sets terminal properties.
+    pub fn init(&mut self) -> AppResult<()> {
+        terminal::enable_raw_mode()?;
+        crossterm::execute!(io::stdout(), EnterAlternateScreen, EnableMouseCapture)?;
+
+        // Define a custom panic hook to reset the terminal properties.
+        // This way, you won't have your terminal messed up if an unexpected error happens.
+        let panic_hook = panic::take_hook();
+        panic::set_hook(Box::new(move |panic| {
+            Self::reset().expect("failed to reset the terminal");
+            panic_hook(panic);
+        }));
+
+        self.terminal.hide_cursor()?;
+        self.terminal.clear()?;
+        Ok(())
+    }
+
+    /// [`Draw`] the terminal interface by [`rendering`] the widgets.
+    ///
+    /// [`Draw`]: ratatui::Terminal::draw
+    /// [`rendering`]: crate::ui::render
+    pub fn draw(&mut self, app: &mut App) -> AppResult<()> {
+        // self.terminal.draw(|frame| ui::render(app, frame))?;
+        self.terminal
+            .draw(|frame| frame.render_widget(app, frame.area()))?;
+        Ok(())
+    }
+
+    /// Resets the terminal interface.
+    ///
+    /// This function is also used for the panic hook to revert
+    /// the terminal properties if unexpected errors occur.
+    fn reset() -> AppResult<()> {
+        terminal::disable_raw_mode()?;
+        crossterm::execute!(io::stdout(), LeaveAlternateScreen, DisableMouseCapture)?;
+        Ok(())
+    }
+
+    /// Exits the terminal interface.
+    ///
+    /// It disables the raw mode and reverts back the terminal properties.
+    pub fn exit(&mut self) -> AppResult<()> {
+        Self::reset()?;
+        self.terminal.show_cursor()?;
+        Ok(())
+    }
+}
diff --git a/src/frontend/ui.rs b/src/frontend/ui.rs
new file mode 100644
index 0000000..ec5e612
--- /dev/null
+++ b/src/frontend/ui.rs
@@ -0,0 +1,201 @@
+use ratatui::{
+    buffer::Buffer,
+    layout::{Constraint, Layout, Rect},
+    style::{
+        palette::tailwind::{GRAY, SLATE},
+        Color, Modifier, Style, Stylize,
+    },
+    symbols,
+    text::Line,
+    widgets::{
+        Block, HighlightSpacing, List, ListItem, Padding, Paragraph, StatefulWidget, Widget, Wrap,
+    },
+};
+
+use crate::frontend::app::{App, TagListItem};
+
+use super::app::EntryListItem;
+
+const MAIN_BLUE_COLOR: Color = Color::Indexed(39);
+const MAIN_PURPLE_COLOR: Color = Color::Indexed(129);
+const BOX_BORDER_STYLE_MAIN: Style = Style::new().fg(Color::White).bg(Color::Black);
+const NORMAL_ROW_BG: Color = Color::Black;
+const ALT_ROW_BG_COLOR: Color = Color::Indexed(234);
+const SELECTED_STYLE: Style = Style::new()
+    .fg(MAIN_BLUE_COLOR)
+    .add_modifier(Modifier::BOLD);
+const TEXT_FG_COLOR: Color = SLATE.c200;
+
+pub const fn alternate_colors(i: usize) -> Color {
+    if i % 2 == 0 {
+        NORMAL_ROW_BG
+    } else {
+        ALT_ROW_BG_COLOR
+    }
+}
+
+impl From<&TagListItem> for ListItem<'_> {
+    fn from(value: &TagListItem) -> Self {
+        let line = Line::styled(format!("{}", value.info), TEXT_FG_COLOR);
+        // match value.status {
+        // Status::Todo => Line::styled(format!(" ☐ {}", value.todo), TEXT_FG_COLOR),
+        // Status::Completed => {
+        //     Line::styled(format!(" ✓ {}", value.todo), COMPLETED_TEXT_FG_COLOR)
+        // }
+        // };
+        ListItem::new(line)
+    }
+}
+
+impl From<&EntryListItem> for ListItem<'_> {
+    fn from(value: &EntryListItem) -> Self {
+        let line = Line::styled(format!("{}, {}", value.authors, value.title), TEXT_FG_COLOR);
+        ListItem::new(line)
+    }
+}
+
+impl Widget for &mut App {
+    fn render(self, area: Rect, buf: &mut Buffer) {
+        let [header_area, main_area, footer_area] = Layout::vertical([
+            Constraint::Length(2),
+            Constraint::Fill(1),
+            Constraint::Length(1),
+        ])
+        .areas(area);
+
+        let [list_area, item_area] =
+            Layout::vertical([Constraint::Fill(1), Constraint::Fill(1)]).areas(main_area);
+
+        let [tag_area, info_area] =
+            Layout::horizontal([Constraint::Percentage(30), Constraint::Fill(1)]).areas(item_area);
+
+        // Render header and footer
+        App::render_header(header_area, buf);
+        App::render_footer(footer_area, buf);
+        // Render list area where entry gets selected
+        self.render_entry_list(list_area, buf);
+        // Render infos related to selected entry
+        // TODO: only placeholder at the moment, has to be impl.
+        self.render_taglist(tag_area, buf);
+        self.render_selected_item(info_area, buf);
+    }
+}
+
+impl App {
+    pub fn render_header(area: Rect, buf: &mut Buffer) {
+        Paragraph::new("Ratatui List Example")
+            .bold()
+            .centered()
+            .render(area, buf);
+    }
+
+    pub fn render_footer(area: Rect, buf: &mut Buffer) {
+        Paragraph::new("Use g/h to move, h to unselect, g/G to go top/bottom.")
+            .centered()
+            .render(area, buf);
+    }
+
+    pub fn render_entry_list(&mut self, area: Rect, buf: &mut Buffer) {
+        let block = Block::bordered()
+            .title(
+                Line::raw(" Selection List ")
+                    .centered()
+                    .fg(Color::Indexed(39)),
+            )
+            // .borders(Borders::TOP)
+            .border_set(symbols::border::ROUNDED)
+            .border_style(BOX_BORDER_STYLE_MAIN)
+            .bg(Color::Black); // .bg(NORMAL_ROW_BG);
+
+        // Iterate through all elements in the `items` and stylize them.
+        let items: Vec<ListItem> = self
+            .entry_list
+            .entry_list_items
+            .iter()
+            .enumerate()
+            .map(|(i, todo_item)| {
+                let color = alternate_colors(i);
+                ListItem::from(todo_item).bg(color)
+            })
+            .collect();
+
+        // Create a List from all list items and highlight the currently selected one
+        let list = List::new(items)
+            .block(block)
+            .highlight_style(
+                Style::new()
+                    .fg(MAIN_PURPLE_COLOR)
+                    .add_modifier(Modifier::BOLD),
+            )
+            // .highlight_symbol("> ")
+            .highlight_spacing(HighlightSpacing::Always);
+
+        // We need to disambiguate this trait method as both `Widget` and `StatefulWidget` share the
+        // same method name `render`.
+        StatefulWidget::render(list, area, buf, &mut self.entry_list.entry_list_state);
+    }
+
+    pub fn render_selected_item(&self, area: Rect, buf: &mut Buffer) {
+        // We get the info depending on the item's state.
+        // INFO: Only a placeholder at the moment:
+        let info = "Infor for selected item".to_string();
+        // TODO: Implement logic showin informations for selected entry:
+        // let info = if let Some(i) = self.tag_list.state.selected() {
+        //     "Infor for selected item".to_string()
+        //     // match self.todo_list.items[i].status {
+        //     //     Status::Completed => format!("✓ DONE: {}", self.todo_list.items[i].info),
+        //     //     Status::Todo => format!("☐ TODO: {}", self.todo_list.items[i].info),
+        //     // }
+        // } else {
+        //     "Nothing selected...".to_string()
+        // };
+
+        // We show the list item's info under the list in this paragraph
+        let block = Block::bordered()
+            .title(Line::raw(" Item Info ").centered())
+            // .borders(Borders::TOP)
+            .border_set(symbols::border::ROUNDED)
+            .border_style(BOX_BORDER_STYLE_MAIN)
+            .bg(Color::Black)
+            .padding(Padding::horizontal(1));
+
+        // We can now render the item info
+        Paragraph::new(info)
+            .block(block)
+            .fg(TEXT_FG_COLOR)
+            .wrap(Wrap { trim: false })
+            .render(area, buf);
+    }
+
+    pub fn render_taglist(&mut self, area: Rect, buf: &mut Buffer) {
+        let block = Block::bordered()
+            .title(Line::raw(" Tag List ").centered())
+            .border_set(symbols::border::ROUNDED)
+            .border_style(BOX_BORDER_STYLE_MAIN)
+            .bg(Color::Black)
+            .padding(Padding::horizontal(1));
+
+        // Iterate through all elements in the `items` and stylize them.
+        let items: Vec<ListItem> = self
+            .tag_list
+            .tag_list_items
+            .iter()
+            .enumerate()
+            .map(|(i, todo_item)| {
+                let color = alternate_colors(i);
+                ListItem::from(todo_item).bg(color)
+            })
+            .collect();
+
+        // Create a List from all list items and highlight the currently selected one
+        let list = List::new(items)
+            .block(block)
+            .highlight_style(SELECTED_STYLE)
+            .highlight_symbol("> ")
+            .highlight_spacing(HighlightSpacing::Always);
+
+        // We need to disambiguate this trait method as both `Widget` and `StatefulWidget` share the
+        // same method name `render`.
+        StatefulWidget::render(list, area, buf, &mut self.tag_list.tag_list_state);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d199c9e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,67 @@
+use std::{fs, io};
+
+use backend::cliargs::{self, CLIArgs};
+use ratatui::{backend::CrosstermBackend, Terminal};
+
+use crate::{
+    frontend::app::{App, AppResult},
+    frontend::event::{Event, EventHandler},
+    frontend::handler::handle_key_events,
+    frontend::tui::Tui,
+};
+
+use sarge::prelude::*;
+
+pub mod backend;
+pub mod frontend;
+
+#[tokio::main]
+async fn main() -> AppResult<()> {
+    // Parse CLI arguments
+    let parsed_args = CLIArgs::parse_cli_args();
+
+    // Print help if -h/--help flag is passed and exit
+    if parsed_args.helparg {
+        println!("{}", cliargs::help_func());
+        std::process::exit(0);
+    }
+
+    if parsed_args.versionarg {
+        // println!("Version Zero");
+        println!("{}", cliargs::version_func());
+        std::process::exit(0);
+    }
+    // TODO: Implement logic for CLI arguments/options which need to be handled
+    // before the TUI is started
+
+    // Create an application.
+    let mut app = App::new();
+
+    // TEST: Get Data from main bibliography
+    // let bibfile = fs::read_to_string("test.bib").unwrap();
+    // let biblio = Bibliography::parse(&bibfile).unwrap();
+
+    // Initialize the terminal user interface.
+    let backend = CrosstermBackend::new(io::stdout());
+    let terminal = Terminal::new(backend)?;
+    let events = EventHandler::new(250);
+    let mut tui = Tui::new(terminal, events);
+    tui.init()?;
+
+    // Start the main loop.
+    while app.running {
+        // Render the user interface.
+        tui.draw(&mut app)?;
+        // Handle events.
+        match tui.events.next().await? {
+            Event::Tick => app.tick(),
+            Event::Key(key_event) => handle_key_events(key_event, &mut app)?,
+            Event::Mouse(_) => {}
+            Event::Resize(_, _) => {}
+        }
+    }
+
+    // Exit the user interface.
+    tui.exit()?;
+    Ok(())
+}
diff --git a/test.bib b/test.bib
new file mode 100644
index 0000000..a4b6dbd
--- /dev/null
+++ b/test.bib
@@ -0,0 +1,48 @@
+@online{how_tex_macros_actually_work,
+    title         = {How {TeX} macros actually work},
+    shorttitle    = {How {TeX} macros actually work},
+    url           = {
+        https://www.overleaf.com/learn/latex/How\_TeX\_macros\_actually\_work\%3A\_Part\_1
+    },
+    urldate       = {2024-04-05},
+    note          = {6 parts},
+    organization  = {Overleaf},
+    abstract      = {
+        An online {LaTeX} editor that's easy to use. No installation, real-time
+        collaboration, version control, hundreds of {LaTeX} templates, and
+        more.
+    },
+    langid        = {english},
+    shorthand     = {Overleaf: TeX macros},
+}
+
+@online{grandsire_the_metafonttutorial_2004,
+    title         = {The METAFONTtutorial},
+    author        = {Grandsire, Christophe},
+    url           = {http://metafont.tutorial.free.fr/downloads/mftut.pdf},
+    urldate       = {2024-04-05},
+    date          = {2004-12-30},
+    version       = {0.33},
+}
+
+@online{gruber_markdown,
+    title         = {Daring Fireball},
+    author        = {Gruber, John and Pan, Petra},
+    url           = {https://daringfireball.net/projects/markdown/},
+    urldate       = {2024-04-08},
+    organization  = {The Daring Fireball Company LLC},
+    shorthand     = {Gruber: Markdown},
+}
+
+@online{skibinski_automated_jats_xml_to_pdf_conversion_2018,
+    title         = {Automated JATS XML to PDF conversion},
+    author        = {Skibinski, Luke},
+    url           = {https://github.com/elifesciences/jats-xml-to-pdf/blob/master/report.md},
+    urldate       = {2024-04-04},
+    note          = {Zitiert nach der PDF Version},
+    date          = {2018-11-09},
+    organization  = {eLife Sciences Publications Ltd},
+    file          = {
+        :/home/lukeflo/Documents/literature/skibinski\_automated\_jats\_xml\_to\_pdf\_conversion\_2018.pdf:PDF
+    },
+}