If you press the Windows Key and the "L key" at the same time, it will lock the computer.
Ctrl-Alt-Delete Method
When you press "Ctrl" + "Alt" + "Delete" at the same time, you can click on the "Lock" option to lock the computer.
Start Method
When you click on the Start Icon on the bottom left of the screen, you can then click on your profile icon, and be given a window that give the lock option to the computer.
