I’ve heard of Usenet, but never used it. It was once (maybe ~15 years ago) advertised as an alternative to torrents, but I don’t get the vibe that’s the primary use case. What can I do with Usenet? The internet has become so boring, I’d be open to exploring something else, but I’ve got no idea what Usenet is.
I'm open to correction, but I believe it's essentially a bunch of email lists. You can post to rec.games.roguelike.angband, your message will go to a server somewhere (theoretically, to every Usenet provider), and people who want to discuss, or read discussion of, Angband, can ask that server for the set of messages associated with rec.games.roguelike.angband. So email, if you sent mail to topics rather than to recip…
Usenet is typically accessed with a news reader application like Thunderbird. Thunderbird is not just a email client. It is also a news client that allows you to subscribe to and post to newsgroups.