Select the current data or entire worksheetCtrl + A
Copy the selected cellsCtrl + C
Display "Find and Replace" dialog boxCtrl + F
Display "Print" windowCtrl + P
Save your workCtrl + S
Undo the last actionCtrl + Z
Cycle through absolute and relative referencesF4
Insert a new worksheetShift + F11
Start a new line in the same cellAlt + Enter

Navigation Shortcuts

Move to top of current dataCtrl + ↑
Move to bottom of current dataCtrl + ↓
Move to left edge of current dataCtrl + ←
Move to right edge of current dataCtrl + →