Okay, now that’s more clear, but I’m struggling to understand if I have to use all of them separately or I can do it all through kbin…I can use Lemmy and Mastodon through kbin somehow, right?
You can access and comment in Lemmy from kbin, but I’m not sure if you can do the same for Mastodon. But Mastodon users can certainly use their accounts to comment on Lemmy. The beauty of the fediverse (or threadiverse, as some guys like to call it)
Kbin is sort of a hybrid between Lemmy and Mastodon. “Magazines” are their equivalent of Lemmy communities/Reddit subreddits, while the “Microblog” section is like a Mastodon/Twitter feed. You should be able to follow Lemmy communities and Mastodon users both on kbin.
I think Mastodon users can follow Lemmy communities and comment on Lemmy through Mastodon, too, though from what I’ve read the Mastodon UI isn’t really set up to show Lemmy content in an organized way with good threading since its main aim is to support microblogging and following individual users. There are some things in the fediverse that you can do from multiple platforms, but will have an easier time doing it from the platform that is designed around that function.