Password managers are widely favored. I use Bitwarden to save all my usernames, passwords, nostr private and public keys, etc. It’s free, open source, hosted (but can also be self hosted), and works across virtually all operating systems, smartphones, browsers. A lot of people like 1Password as it’s a solid password manager and has all the same features as Bitwarden, although it’s not open source. I’ve used both, prefer Bitwarden, but you can’t go wrong. Just don’t use LastPass.
Nostr and beyond, in general, you should never be hand typing any password (at signup or login) except for your password manager’s master password. Any password that you sign up with on any website should be randomly generated by your password manager, and should have a mix of lower and upper case letters, numbers, symbols, and be the longest that either the website or the password manager allows. That prevents a bad actor from guessing your password or reusing one from a different website. Once you’ve figured all that out, bonus points for enabling two/multi factor authentication. If someone guesses your password, they would still need one of your physical devices to get in. That’s the bonus round, but not that difficult to set up in my opinion, and well worth it if you care about your personal data.
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