Log out of and lock your computer when stepping away, even for a moment.
For a quick way to lock your PC, press Windows Key + L.
Forgetting to log out poses a security risk with any computer that is accessible to other people because it leaves your account open to abuse.
Disable Remote Desktop (RDP) and Remote Assistance, until you require these features. Enable the remote connections when needed, and disable them when you’re finished. Note that you only need to enable RDP on the computer you intend to connect to. Disabling RDP on the computer you’re connecting from will not prevent you from making a connection to another computer.