Complex Passwords - Hard to remember
Here, try this password on for size:
Your password can be brute forced in less than one second
(based on 30.96 billion guesses per second, the rate of a GTX 1080 Ti as of July 2017).
Recommended Password Software
KeePass - Highly recommended for password storage and creation. Available for multiple platforms including Windows and Android (sync your password database with your phone).