The first lesson is like you should be using a password manager, because that's the kind of absolute root of your security. One of the challenging things about adopting a password manager - especially if you haven't got one already - is you really need to memorize it and you really can't forget that. You have to think about not just confidentiality, but there's this thing called the CIA triad,. And if you get hacked and people steal your secrets, then they can access your cloud and it's game over.