Supercomputers are usually just a lot of smaller computers that happen to be connected with very efficient networking. Then you use something like MPI to simulate a big pool of shared memory.
Yes, I think port forward and domain name is required not just for Lemmy but for every ActivityPub service (Kbin too).
My custom blog, Syncthing and now I’m trying Lemmy and Mastodon. Let’s see how it goes!
I always found “find” very confusing. Currently, I’m using “fd”, which I think has a more sensible UX