Do I need to log out before shutting down my computer?

If you're getting a new CPU installed, the repair person may need to log into Windows to deal with OS or driver issues. You might want to provide them with admin access, just in case they need it.

Sounds like you might be confusing sleep mode with shutting down. If you were properly shutting down, you wouldn’t worry about your session still being active. Just be sure to check if it asks for a PIN or password the next time you boot up.

Yes, your account is logged out every time you restart or shut down. If your computer loses power suddenly, like during a power outage or if you unplug it without shutting down, it won’t be logged in when you turn it back on since it didn't save that session.

When you shut down your computer, your account is indeed logged out. However, that doesn’t necessarily prevent someone from accessing your files if they have physical access to your computer. It’s worth checking if your hard drive is encrypted for added security.