Using no password manager and a different password for every account would be the most secure option but most people (including me) would be too lazy for that. Instead I used to use the same password everywhere, which is obviously very unsafe. I then switched to Bitwarden, where I can just generate a secure password for each account and I can access them all with one password. I still need to remember only one password but it’s a lot more secure than using the same one everywhere.