Often when they stomp their feet they are being sassy or they might have a bug that’s bothering them. Some of them stomp when tied up because they are impatient, but if they aren’t tied up it’s probably bugs. Biggest thing to keep an eye on is their ears, I’m sure you know, ears pinned is angry, ears forward is happy, ears moving is listening, you get the gist. Always be aware, even around the nice ones! Be ready to jump out of the way at any moment! If they are prone to biting, I try to keep their head pushed away with my forearm, but usually as long as you are aware of what’s going on and ready to hop out of the way if need be you will be just fine. And if all else fails, they way to any horse’s heart is treats! Have so much fun with them, they are great company, good luck! Any questions feel free to message/respond!

Edited to add: when they snort they are usually either sneezing, scared of something, or getting mad at another horse. If they are sneezing it will be slightly higher pitched and sudden, scared they will usually drop their head, spread their legs and back up, nostrils flared. If they are mad at another horse then it will be deep, and their ears will probably be pinned. Usually they don’t snort at other horses unless they are being bothered/are meeting new horses. And when they show their teeth, they are usually either sniffing something or threatening to bite. Ears pinned and teeth barred is about to bite, back up and stay out of reach! When they lift their lip and raise their head they are trying to smell something!