2 ways to lock a Windows computer from your keyboard and quickly secure your data

One way to lock a Windows computer from your keyboard is by pressing Ctrl + Alt + Del and then selecting the "Lock" option.
ZDNet

How to automatically lock your Windows PC with Dynamic Lock

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Ars Technica

Locking down a computer in a dorm room?

Well, I'm moving into my dorm room and I have a rather nice computer that I'm bringing up. Can anyone suggest some good methods for locking it down from people stealing it? The door will never be open ...