1. The fastest way == >
I always do this when I want to shutdown my computer. Just press the Windows key (on the keyboard) and press U key two times.
2. Shutdown from desktop ==>
Create a shortcut on your desktop. Right click > New > Shortcut. In the box, enter this: SHUTDOWN -s -t 01 and click Next. In the next prompt, enter the name for the new shorcut (eg: Shutdown PC).
3. From Task Manager
Hold Ctrl + Alt + Del to open Task Manager. In Shut Down tab, choose Turn Off.
4. Super duper the fastest way
You only can use this if your keyboard equip with the Power button. Just press the button and leave your PC to shut down