Subscribing to the same magazines/communities on Kbin and Lemmy?

Just starting to familiarize myself with everything after about a decade at reddit. I understand that you can view content across instances but I'm noticing that both kbin and lemmy have similar (competing?) magazines/communities.

For example @PCGaming and !pcgaming (lemmyworld) but then there is also, @pcgaming, !pcgaming@lemmy.ca, etc.

Do I have to subscribe to all of them? Or are there "official" fediverse communities?

As I said, I'm still trying to figure things out, but subscribing to so many similar communities seems cumbersome for the user and (imo) fragments userbases that are literally talking about the same thing.

Thanks in advance!