Set Next Tool or Edit Mode ⌥⇟
I only know about a few tools, the ones I use. Pointer, Marquee, Pencil (rarely), Eraser (rarely).
I should become familiar with them all, and understand where they help the workflow.
For now I am assigning the command-click tool to be ‘Solo’ since I have automatic Marquee tool set for lower half of regions. Remarkably handy.
The following section describes common tools available in the Tracks area and in other working areas.