TAB - Switch Between Session and Arrangement

Z - Zoom to Selection

Opt Cmd/Ctrl B - Show or Hide Browser

W - Optimized Zoom Out View

H - Optimized Height View

Shift + Directions - Selects multiple things

U - open or collapse tracks

ALT and - or + - resize tracks 

Cmd/Ctrl 1 or 2 - double or half the grid subdivisions

Cmd/Ctrl 3 - Triplet Grid

Cmd/Ctrl 4 - enable or disable Grid

Cmd/Ctrl E - Split

Cmd/Ctrl Z - Undo

Shift Cmd/Ctrl Z - Redo

Direction Keys - Move selections

Cmd/Ctrl + Direction Keys - Move along grid

A - Automation Toggle

Full List of Ableton Keyboard Shortcuts:

https://www.ableton.com/en/manual/live-keyboard-shortcuts/