Format (almost) anything Ctrl 1 1
Display Format Cells with Font tab selected Ctrl Shift F F
Apply or remove bold formatting Ctrl B B
Apply or remove italic formatting Ctrl I I
Apply or remove underscoring Ctrl U U
Apply or remove strikethrough formatting Ctrl 5 X
Add or remove the shadow font style   W
Add or remove the outline font style   D
Align center Alt H A C E
Align left Alt H A L L
Align right Alt H A R R
Indent Alt H 6 Tab
Remove indent Alt H 5 Tab
Increase font size one step Alt H FG >
Decrease font size one step Alt H FK <