You don’t get federated automatically. On your own instance you will only see posts in communities that you subscribe to. What I did was set up a “bot” user that I used to subscribe to a bunch of communities that I might find interesting when just browsing the All feed but I didn’t want in my personal Subscribed feed. There’s a few tools that will automatically subscribe a bot user on your instance to all the top communities but I found just manually going through https://lemmyverse.net/communities and clicking subscribe as that bot user worked for me.
You don’t get federated automatically. On your own instance you will only see posts in communities that you subscribe to. What I did was set up a “bot” user that I used to subscribe to a bunch of communities that I might find interesting when just browsing the All feed but I didn’t want in my personal Subscribed feed. There’s a few tools that will automatically subscribe a bot user on your instance to all the top communities but I found just manually going through https://lemmyverse.net/communities and clicking subscribe as that bot user worked for me.