Everyone can have their own Reddit

A Reddit has subreddits as well (communities inside)

Your account is made on and tied to a specific Reddit of your choice.

Your Reddit and its “stuff” can be seen by other Reddits normally.

However, if one Reddit decided they don’t fuck with your Reddit, they can remove it from their list of reddits they fuck with. This means that Reddit and their users won’t see your Reddit’s stuff anymore

It’s kinda like instead of having 1 cafeteria with a Bunch of lunch tables, we have a bunch of cafeterias, and each table can decide if they want to block out another cafeteria so they don’t have to hear them anymore. This doesn’t affect other cafeterias or who they do want to hear.

Hope this helped! Please correct me if I’m wrong as well

Otherwise, you can see all the stuff from any other Reddit so long as it is in your Reddit’s network.