Once all open programs are closed, you must Exit Windows. You can use the Exit command at the bottom of the File menu of the Program Manager or double-click on the icon on the left of the Program Manager titlebar. You will get a confirmation box where you will need to choose OK . Don't turn offthe computer while you are still in Windows. It can scamble Windows' brains.
Some programs have a keystroke combination also.
As you work with your programs you will learn what methods work best you. But do try out all the choices. As you gain skills and work with your programs, you may find that different methods are more efficient now. Restart Does a Warm Boot by closing everything down but immediately starting the computer up again. This method avoids the wait for the hard drive to stop spinning before you could reboot manually.