Mods are typically the people running - and paying for - the instance in most cases on Lemmy, and they tend to be active on the instances they run, so if you report a post it may well be to the person that made it.
Expect less active moderation and less content.
You’ll probably see a lot of reposts and batches of posts from the same communities if you sort by “New”.
Make liberal use of the “block” functions, for both users and communities.
Trolls, spam, DDOS attacks, etc etc, can be pretty common. Bugs seem to have smoothed out and are rarer than in the early days.
The Voyager client (on Android 14 at least) will reload if you switch away for more than a few seconds at a time. It’ll save your text if you have a comment in progress, but make sure you have a way to get back to what you were reading (save, upvote, etc) if you switch away to find a GIF or link or something so you can pick up where you left off.