Alt, Click, Comma, Dot are the most used when it comes to fine tuning your cuts or transitions.
Alt+Click allows you to select certain items like audio only or video only or audio transition or video transition only.
The Comma and Dot keys allow you to move the selected area 1 frame at a time
In most cases Ripple Mode should be off and Sync Mode should be on (I never use ripple mode at all)
Trimming and split trimming clips with Alt, Click, Comma, Dot, watch video
Trimming and split trimming transitions with Alt, Click, Comma, Dot, watch video
(this video also shows the use of Alt+M and Alt+N)
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