First off if there is a better place for this question please let me know.

I am wondering if there is a discord (ironic i know if there is something equvialent let me know) where I can get into contact with people developing in this space.

I am hoping to get some questions answered such as:

How does a different architecture like kbin@social ui (and possible backend) communicate with posts from lemmy? Is it through ActivityPub?

Could someone from lemmy login to mastodon with their same account? Why or why not?

Could two different fediverse apps technically do all the same things if they used the exact protocol to do the same things with a different ui?

If someone wanted to go about making their own fediverse app where is a good first learning step?