A computer isn't like many electronic devices in that you can't simply cut power to it (by unplugging it or by using the power switch on the computer) if you don't shut it down properly, it will likely button, then click TURN OFF computer, a small dialog box will pop up and you select whichever option you need.
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To switch the computer off, select Turn Off, if you need to restart the computer becouse a program has become buggy, you would select Restart. that would shut the computer down and then restart windows.
And if you want to Turn off the Computer by short cut way you can also type on keyboard
Alt + f4 a small dialog box which cointan 4 options hybernate, stand by, turn off, restart, will appeared on screen and you click on turn off, your computer will been shutdown.