save: Ctrl+S
import: Ctrl+I
Undo: Ctrl+Z
Duplicate: Ctrl+Shift+/
Link: Ctr+l
Select all: Ctrl+A

As we are colour grading our entire film, paste attributes is a handy shortcut so the same colour levels are used in each shot. The shortcut is Ctrl+Alt+V
Mark In and Mark Out are used all the time so their shortcuts are handy also.
Mark in: I
Mark out: O