Lemmy

So I got this instance up yesterday and I didn't (still don't) really understand federation.

Does any one have a tutorial or an explainer I could tuck into that can help me figure out how to effectively federate/ connect to other lemmy instances?

For example, I connected to !memes!memes@lemmy.ml. It appears to now be 'federated', in that when I look at 'all communities' on !wsb_memes@wallstreets.bet , then I see posts. Whats weird though, is that they are all 18 hours behind, and have no activity.

I really want to support the growth of the lemmy verse. I think the best way to do this is with unique, niche focused federated instances for 'groups' of specific interests. wallstreets.bet is how I thought I could support that. But I'm struggling with the federation aspect and I'm not sure its working correctly.