I looked up a list of Lemmy World instances and signed up for a bunch, but how do I see everything at once in one app instead of downloading one for each instance? I am new to what the kids call "federation." Thank you.
You are doing it right, even on desktop it's the same thing. All one needs to do is search for a community from other instance in your own indtance and subscribe, you can even subscribe for communities outside of lemmy like kbin and beehaw
You don't need to sign up for each instance (server). You only need to sign up for one. When you login to that one and search from it, the results will include things from other instances (servers) as well.
And if a search result is a community (subreddit), you can subscribe to it as well. They will show up in your feed next time you refresh. If a community says "subscription pending", just ignore it. You are already subscribed.
yes, you can. you only need to sign up for one instance, thats your "home base" and you can see everything from everywhere else from it. it's like you can make a gmail account and still email ymail, yahoo, outlook, whatever else