The same material is in the program under Help → Keyboard Shortcuts and Help.

Files and editing

KeyDoes
Ctrl+OOpen Media
Ctrl+EQueue the current export
Ctrl+ZUndo
Ctrl+Shift+ZRedo

Modes

KeyDoes
Ctrl+Shift+AAudio Mode
Ctrl+Shift+VVideo Mode

Playback and marking

KeyDoes
SpacePlay or pause
ISet In at the playhead
OSet Out at the playhead
Left, RightNudge 0.1 seconds
Shift+Left, Shift+RightNudge 0.01 seconds

In Video mode, Previous Frame and Next Frame step exactly one frame. They stay disabled until the file's analysis has finished, and say so when you hover them.

Menus and panels

KeyDoes
Arrow keysMove through a menu
EnterChoose the highlighted item
EscapeClose the menu or dialog
TabMove to the next control, including panel dividers

Resizing panels from the keyboard

This one is worth knowing and almost nobody finds it.

Tab until a panel divider has focus, then the arrow keys resize it. Hold Shift to move faster. Home and End take it to its limits.

View → Restore Default Layout puts everything back when the window stops making sense.