You Probably are used to using hotkeys in Windows 7 or older versions, Windows 8 uses a lot of the old hotkeys and has some of its own.
Windows Key – brings up the Metro start screen
Windows Key + C -Brings up the Charms menu
Windows Key + D – Brings up the Windows Desktop that your used to
Windows Key + F – Brings up the Metro file search screen
Windows Key + H – Opens the Metro share panel
Windows Key + I – Opens the settings panel
Windows Key + J – Switches focus between snapped Metro applications
Windows Key + K – Opens the devices panel
Windows Key + Q – Brings up the Metro application Search screen
Windows Key +W – Brings up the Metro stings search screen
Windows Key + Z – Opens the app bar for the current Metro application
Windows Key + , – Aero peak at the desktop
Windows Key + . – Snaps the current Metro application to the right side of the screen
Windows Key + Tab – Opens the Metro application switcher menu
Windows Key + Page Up / Down – Moves the current application to the other screen
Windows Key + Shift + . – Snaps the current Metro application to the left side of the screen
