To shut Windows 8 down, just move the mouse cursor to the bottom right corner of the screen, click the Settings icon - or just hold down the Windows key and press I - and you'll see a power button. Click this and choose 'Shut Down' or 'Restart'.
In Windows 8.1, press Win+X, click 'Shut down or sign out' and select the option you need.
Some of the tricks available in previous versions of Windows still apply. Press Ctrl+Alt+Del, for instance, click the power button in the bottom right-hand corner and you'll be presented with the same 'Shut Down' and 'Restart' options.
And if you're on the desktop, press Alt+F4 and you'll be able to choose 'Shut Down', 'Restart', 'Sign Out' or 'Switch User' options.
