DaVinci Resolve
About
Video editor
Sound
Track Visual:
Dialog - Green
Music - Blue
Sound effect - Yellow
Tools:
Operations
Source Viewer
Show sound. … > Show Full Clip Audio Wave Form
Duration (is given by frames). With a 30 FPS, if you type anymore on the source viewer +60, you will get 2 seconds more.
Timeline
Operations
Trim
The trim menu has a lot of trim options.
There is also a Trim Edit tools that is context sensitive based on what you are typing on the time line.
It changes from:
Ripple Tool: On the edge of the clip. Shorten one side of the other of the clip.

Rolling Edit Tool. Between an edit point, one side short and one side longer

Slip tool. In the middle of the clip on the picture. The length of the clip stays the same as it is. What's changing is what we will see inside of the edit. The timeline viewer show then 4 frames.
Slide tool. In the middle of the clip on the title of the clip. The length of the edit is not changing. The length of the clip on the right and the length of the clip on the left are changing. The timeline viewer show then 4 frames.

Moving clips
Scale / Zooming
Clip
Inspector
The inspector gives properties of a clip
Effects / Transition
Track
You can:
Documentation / Reference