Audio track editing

While editing a freshly recorded track, I need to insert silence within portions of the recording; such as when I edit out a breath, thus making the following portions too tight. How can I add silence at the cursor?

You can click on the track at the point where you want the silence, then use “Generate menu > Silence”.
However, you may find that absolute silence is rather conspicuous. It may be better to copy a bit of “room tone” and paste that into the track rather than absolute silence.