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I think the standard would be to use a password manager such as KeePass, with a long random passphrase such as five to six words chosen truly randomly from a large dictionary.

A folder or notebook in your house is not terrible, actually, since it lets you avoid reusing passwords (though it won't generate strong passwords for you like a password manager will). Harder to back up. You might want to keep it in a fireproof safe.

Programs like keepass are good solutions. I run it in a cloud setting, with a back up on multiple of my own devices. A good strong master password is important.

Writing down passwords may not be the best solution, but it's probably a better solution than most: https://www.schneier.com/news/archives/2010/11/bruce_schneie...

offline password managers are pretty good.