If you memorize this article, your mouse can be unemployed, hehe!
I. Common usages:
F1: Displays the help content of the current program or Windows.
F2: If you have selected a file, this means "Rename".
F3: When you are on the desktop, it opens the "Find: All Files" dialog box. F10 or
ALT: Activates the menu bar of the current program. Windows key or CTRL...