The more you understand the better you can help. You’ve made the first and most important step. I’m extremely passionate about this and you will find many around you are also passionate. I’m a grown ass dude and 46 and could cry.
Talk to their teachers as they get older. The best thing you can ever do is diagnose. There are so many kids in the school system parents bury their heads and it hurts everyone.
If you ever want to talk I’m almost a decade into my autism journey. Started at 3 and my son is now 11.