You can use the following shortcuts to quickly manage the audio editing process:

Shortcut

Action

Delete

Delete Selection

Ctrl-Z

Undo

Ctrl-Y

Redo

Ctrl-+

Zoom In

Ctrl--

Zoom Out

[S]

Stop

Space

Play/Pause

Home

Go to the beginning of the clip (or selection)

End

Go to the end of the clip (or selection)

Arrows

Move cursor position backwards or forwards (small steps)

Ctrl+Arrows

Move cursor position backwards or forwards (bigger steps)

Ctrl+TTrim audio
InsertSilence selection or Insert silence