In Monterey, the Passwords preferences section from Safari graduated up to an official System Preferences panel. I presume this might allow macOS to fill passwords in more apps and other places beyond Safari, but I haven’t tested it much yet.
In System Preferences you can now import and export passwords, but be careful with this one—it only exports as a plain text CSV, which isn’t very safe. This panel also offers the option to monitor and alert you if it notices any of your accounts have been compromised, but I’m not sure how thorough this feature is. I’m still a happy 1Password customer (disclaimer: I worked there for around five years), and their similar Watchtower feature is a great monitoring solution.