Fediverse

Lately I often read about kbin.social being similar to lemmy but more accessible. So I created an account there to check it out. My experience so far is a little mixed. From kbin I can access all Lemmy posts, although I find the interface less intuitive to join new communities. So from the kbin side it feels like an other Lemmy instance.

But when searching for kbin from this Lemmy Account, I do not find much. I feel like I am missing some basic concept, that makes it pretty clear. Why this is such a one way experience.

So now I am wondering: How does this work, what are the difference, what do both sites have in common?