If you only memorize one Windows keyboard shortcut, this should be it. Pressing Windows key+L locks a Windows workstation so that no one can use it without a password, yet it won’t log out the current user or close any open programs.
Locking your workstation prevents spying eyes from looking through your personal data and communications, plus it keeps out that one friend who still thinks it’s hilarious to hijack someone else’s Facebook account.
Don’t just memorize this combo, make it a habit. If you’re getting up from a machine and won’t be able to keep it in view, Windows key+L should be a reflex.