Advice for stepfather

Hi, I have a stepson who has autism, am just looking for some advice on how I can help him out, things that I can do to for him, he's a top little lad incredibly brainy, funny, and just amazing to be around and I want to help him as much as I can but I can get frustrated sometimes but I really don't want to upset him, I just want to be the best person for him as much as I can, if there's any advice anyone can give me to make things better for him please send a message back :)