I couldn't live without one these days. I personally use Bitwarden. I have tried most of the other manager suggested in this thread. They each their own benefits. I would recommend one of the hosted services for most people (1password, Bitwarden, not LastPass). I came to prefer Bitwarden for their combination of features and openness. I have self hosted it in the past, but these days just use their hosted service.
There are a lot of side benefits to using one besides just remembering your usernames and passwords for you too.
@rbar
@lemmy.world