Never use a password manager, this is very risky especially if you use a third party then indirectly this will be easy for other people to break especially now that hacking has started.
Password - just remember it with a strong word or write it on paper to make it more secure.
I myself do with memory maybe some easy passwords, while complex passwords are then written on paper.
I honestly think that nowadays a lot of people use password manager, I used both google and apple password manager because it's very convenient and allow us to have a really long and strong password without forgetting about it. I wonder if they're investing good money into their security infrastructure, I hope they do.
I personally never used dedicated password manager services offered by a company whose sole product is password manager though, it feels unsecure handing over password to third party company even if they encrypted the whole thing.
If I recall correctly, Google password manager have on-device encryption that encrypt the passwords behind device specific biometric that even Google themselves can't have access to.