You can modify it to do what you want more or less. The only common core is that it is all federated via ActivtyPub, the rest is decided by modules, which include microblogging like Mastodon, but I think (not entirely sure) also group forums like Lemmy. It’s early days for the project still.
Generally I find following the #solarpunk hashtag on the (microblogging) Fediverse already to yield some good results to find interesting stuff. #permacomuting is also an interesting hashtag usually.