Protect access to system through a secure password, keep it secret and change it frequently.

Instructions for generating a secure password and the correct handling of passwords can be found here.

Do not use the same password for all possible IT services and applications that require a password. Whenever possible, two-factor authentication is preferable to the simple password. For mobile devices like smartphones, you should use secure access protection (screen lock). Not secure are: none, swipe, pattern.

Never store your passwords on your computer.
All user accounts on your computer should be provided with a secure Password.