These work in all the MS Office programs:
F4 – Repeat the last command. Useful if you are doing repetitive formatting in a file
F7 – Run the Spellcheck
F12 – Save As
Shift+F3 – Change case. Cycles between lowercase, Title Case and UPPERCASE (not Excel)
Alt+F4 – Close the window. Same as Close command or X button at top right. Quicker if you are already on the keyboard: Ctrl+S, Alt+F4.