I personally use KeePass, I generate 20+ character random passwords and it save them in a encrypted file. I just wrote my email password and hide it in case I lose my file.
I also use KeePass to generate long, pseudo-random passwords. The amount of different passwords I need is far beyond what I can hold in my head, especially when they have to be secure. I got my closest family to use KeePass too, which lead to a significant reduction in lost passwords and hacked accounts.