To keep your computers sensitive information safe from others while your computer is left unattended and to save the power of your battery it is best to put it in Hibernation mode.
You can also put the computer to sleep by using the Start Menu.
- Click on Start
- Click the small arrow next to shut down
- From the pop out menu, click Hibernate
Another option that can be used to lock your computer is to use CRT+ALT+Delete
- Press CRT+ALT+Delete
- Click Hibernate