We recommend that you choose a sentence, then use the first letter of each word and the punctuation to create a passphrase that has upper and lower case letters and special characters.

The phrase The password
My dog's birthday is April 7. When is yours? Md'sbiA7.Wiy?
I've been to Hawaii 3 times in my life. IbtH3ximl.

Your password can't use your user ID and shouldn't contain dictionary words in any language.