From Avast: Password Tip

The hardest password to crack is a long one. Instead of thinking of a collection of letters and numbers, try going with a sentence. While no password is unable to be cracked, longer passwords deter cyber-criminals, because they take much longer.

If you have trouble remembering passwords, you may want to use a password manager, software that generates random passwords for multiple websites and stores them for you. The user only needs to remember one password to log into the software.

Here are the best ways to keep your accounts secure:  via CNBC