Ppl have already provided really good information.
I wanted to add that generally a lot of things work in theory rn for Lemmy and other fediverse entities, but a lot of them are still riddled with bugs and stuff, so your experience might not line up with what is theoretically possible.
I’d assume in January a lot of the apps are already broadly usable for the most part with some minor bugs still sticking around. So things will definitely improve greatly over the next while. But until then things might not always look like you’d expect them to.