What would be nice is when instances could merge their communities so there aren’t many dedicated duplicates, like I could imagine there are for example LEGO-communities on 7 instances and the according owners of those communities could initiate that they want to merge with others so everyone can post wherever they are but have a common community-feed.

Ah, so I’m basically posting into foreign communities through my home-instance :).

I didn’t know there are major differences between the instances (like the voting system). I’m basically here because the join-page suggested lemmy.world 🤷🏻‍♂️. But I like it here :). Still haven’t fully understood how these instances work or work not together but I like that you don’t need accounts everywhere you want to post something. Is there a single server that handles user authentication or how do other instances know my account? 🧐