How do I monitor the activities on my computer?

My little brother plays on my laptop öffters when I'm in school. How can I find out when and how long he plays / someone can recommend me a free tracking tool

Well, you can easily see in the Windows Event Viewer when the PC was turned on and off.

How about a password?

How do I get to this ad

I have one but my brother knows all the passwords

You use Win10? Then simply press Windows key and enter Event Viewer.

If other system, then enter Windows key + R → eventvwr → Enter

Ask him

He denies everything

Certainly not. And even if it does, it takes thousands of years to try all possible passwords.

Then lock your computer

Change Password?

Control Panel → Administrative Tools → Event Viewer → (right-click) "Run / Open as Administrator"

(at least in Windows 8)

or type "Event Viewer" in the search field (without the quotation marks), right-click the icon labeled "Event Viewer", then click "Run / Open as Administrator"

Registrations can be found at

Event Viewer (Local) → Windows Logs → Security

Task category "Login" (and / or "Logout")