Other essential features! You can hide your own posts: look at the bottom of the post, there should be "quote", "edit" and "options", clicking the last one will show you the option to hide your post.
You can also hide your topics: top of the page should show two bars: orange one "reply to this topic" and below that "moderation actions", click that and you'll see the option to hide.
You can report a post to the moderators by clicking the little grey flag icon on their posts.
You can choose to follow people or topics that you find interesting. For people, go to their profile, the leftmost blue button that has the facebook add friend icon. For topics, at the bottom of the page, there's a grey bar with the option to follow.
Those are all the essentials off the top of my head. Enjoy!