The function keys - most have us have never even touched them - but, they can actually save you a TON of time if taken advantage of:
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 age or document window.
F6: Moves the cursor to the address bar in most internet browsers.
F7: Used to spell check and grammar check a document in Microsoft Word and sends and receives e-mails in Microsoft Outlook.
F8: Used to access the boot menu in Windows when turning on the computer.
F9: Refreshed a document in Microsoft Word and sends and receives e-mails in Microosft Outlook.
F10: Activates the menu bar of an open application. Shift + F10 s the same as right clicking.
F11: Enters and exits fullscreen mode in internet browsers.
F12: Opens the “save as” dialog box in Microsoft Word.