A password manager is almost not an optional thing. You should have long, random, and unique passwords for most of your services, and you should use the mental resources you'd use to memorize all your passwords, to instead memorize a few passwords (e.g. your phone password, your laptop password, and your 1password password).
You've probably heard annoying people give that screed for years now, so I won't go too deep into it.
There are some other good password managers, I think. There are some bad password managers, like Lastpass. But 1Password is something I have the "cryptography expertise" and also the "I've used this daily for seven years" expertise to recommend.
It's $24 for your first year. If you stop paying, you keep access to your passwords, but the service stops syncing between devices.
flabberghaster wrote
How is it compared to eg, bitwarden? Which is free and does free syncing, but if you pay it also will do OTP codes for you and stuff.