F1- Opens the help screen for almost every program.
F2- Allows you to rename a selected file or folder.
F3- Opens a search feature for an application that is active at the moment.
F4- Alt + F4 closes the active window.
F5- Allows you to refresh or reload the page or document window.
F6- Moves the cursor to the address bar in most internet browsers.
F7- Used to spell check and Grammar also check a document in Microsoft Apps.
F8- Used to access the boat menu in windows when turning on the computer.
F9- Refreshes a document in Microsoft Word and sends & receives email in outlook.
F10- Activates the menu bar of an open application, Shift+F10 is the same as right click.
F11- Enters and exits full screen mode in internet browsers.
F12- Open & save as dialog box in Microsoft word.