I can't say it enough. Make a strong password and change it every six months.
The best passwords start as a sentence you've created about a significant event. Then use the first letter of each word to compose your password. It is always best to have a date in your sentence as well so you can have numbers and letters.
Sample significant event sentence:
My son started using the potty January 2007.
Sample password from sentence above: mssutp0107
