Another thing that might be a bit different from reddit, is that lots of folks here recommend using the Block options for users / communities. Lemmy is a smaller place, so if a particular user keeps posting stuff that isn't what you want to see in a community it can really ruin the experience. It's totally okay to just block people, and is the generally recommended way of dealing with trolls.
Federation, multiple instances, among other things, means that lemmy as whole is less strictly governed by mods than reddit. That's good in many ways, but it does mean that we users have to take some responsibility to create the lemmy we want, and that sometimes means blocking people.
I woke up at 4.30am, two hours before my alarm, and couldn't get back to sleep. This was the first post I saw on lemmy. Being middle aged sucks, I miss sleeping in.