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Use a password with mixed-case letters. Do not just capitalise the first letter, but add uppercase letters.

Use a password that contains alphanumeric characters and include punctuation, where supported by the operating system.

Use a password that can be typed quickly, without having to look at the keyboard. This makes it harder for someone to steal your password by looking at your keyboard (also known as "shoulder surfing").

change passwords regularly. The more critical an account to network integrity the more frequently the password should be changed. This change stops someone who has already compromised an account from continued access.