Hello and welcome! I think you've already encountered the CoC. As for etiquette, just be reasonably polite. And don't resurrect long-dead topics unless you have something relevant to add. Even then, it's preferred that you start a new topic with a link to the old one (exceptions being ongoing topics here in General, like "What are you reading?").
If you want to get to know us, you can read through years of forum posts. We're all in there.