Note Navigation
One of the Trilium's goals is to provide fast and comfortable navigation between notes.
Backwards and forward
To move back and forward in the history of viewed notes, press Alt+← and Alt+→, or use the and buttons to the left of the Tabs.
This works identically to browser backwards / forwards, it's actually using built-in browser support for this.
To go several notes back or forward at once, right-click one of the buttons or press and hold it. The back button lists the notes before the current one and the forward button the notes after it, the nearest first. Each entry shows the note's title, with the path of its parent notes at the end of the row. Selecting a note goes straight to it.
The Go to Previous Note and Go to Next Note launchers of the Launch Bar list the same notes, below the launch bar's own items.

Jump to note
This is useful to quickly find and view arbitrary notes - click on Jump to button on the top or press Ctrl + J . Then type part of the note name and autocomplete will help you pick the desired note.
See Jump to & command palette for more information.