GarageBand

Mute
Solo
Volume
Pan
Effects: Double click track icon

Loop Browser Button

Cycle Region - on the transport

Loop Pointer - top right of a loop region/block. drag it to the rig to repeat

TAKES indicator - top eft of a loop region/block. When recording a take continues to the end of a cycle

ALT drag to create a copy of the region

SPLIT: cursor position. Edit | Split

ARRANGE:
Track | Show Arrange Track
Drag to size of region you want, then double click to name

***
Select a track. Press A to add automation lanes to that track.
Now you can create envelopes for volume, pan, etc.