It is recommended that you follow the below, as well as conduct your own research into creating a strong password.
Passwords should be at least 8 characters or more.
Passwords should contain a combination of lower and upper case characters, and numbers.
(Note:due to database limitations, passwords can only contain alphabetic characters and/or numbers.)
It is highly recommended that your password is changed frequently. A good idea is to set regular reminders.
Make sure that you use different passwords for different websites.
Spell words backwards, Common misspellings, Abbreviations, Sequences or repeated characters, Personal information.