Please stop embedding files/images from Discord. Discord has anti-hotlinking logic in place that breaks links to Discord hosted files and images when linked to from anywhere outside of Discord. There are a multitude of file/image hosting sites you can use instead.
(more info here)
Don't 'annoy' the older members of the forum. A lot of our senior seasoned members are grumpy old men so when a new member comes around poking them in the sides they don't always take it too well. Just stay calm and be yourself, don't try to be overeager though.
Have a decent grasp on the English language. You don't have to be perfect by any means as long as your posts are generally understandable.
Hmm, that is all I can think of at the moment because I've been up for like 52 hours, but just so you know these aren't "rules" pre say, just general tips.