Save Workbook
Ctrl + S
Save As
F12
Ctrl + P
Create New Workbook
Ctrl + N
Open Workbook
Ctrl + O
Open Print Preview
Ctrl + F2
Close Workbook
Ctrl + F4
Close Excel
Alt + F4
Undo Previous Action
Ctrl + Z
Redo Previous Action
Ctrl + Y
Open Help
F1
Clear Cell Contents
Delete
Clear Cell Formatting
Alt>H>E>F
Clear All
Alt>H>E>A