Explanation

 F1 function key is used for opening help.

Some of the top shortcut keys in Microsoft Word are:

Ctrl + S: Save

Ctrl + C: Copy

Ctrl + X: Cut

Ctrl + V: Paste

Ctrl + Z: Undo

Ctrl + Y: Redo

Ctrl + B: Bold

Ctrl + I: Italic

Ctrl + U: Underline

Ctrl + F: Find