This includes license plate numbers, telephone numbers, social security numbers, the brand of your automobile, the name of the street you live on, etc. Don't use a password of all digits, or all the same letter. This significantly decreases the search time for a cracker. Use a password that is easy to remember, so you don't have to write it down. This makes it harder for someone to steal your password by watching over your shoulder.
Some systems have software controls enabled to assist users in conforming to good passwords policy.
Some sample strategies for selecting secure and easy to remember passwords Try words with a combination of upper and lowercase characters, numbers and punctuation marks, consonants and vowels, etc. You can use a simple character substitution scheme to create a password that's easy to remember but hard to crack. Use uppercase letters for vowels and lowercase letters for consonants. Some examples Choose a line or two from a song or poem, and use the first letter of each word. This provides nonsense words that are usually pronounceable, and thus easily remembered.