"I assume your son is a school student. I'd recommend something that he could make mistakes on and get hooked enough to motivate him to explore more.
For him to expose to aerial cinematography, a Tello drone is good start.
For purely fun stuff,…"
Buying a drone will depend on what exactly you are looking for and what is your spending limit.
If you are ready to spend some $ then
DJI Mavic Pro Platinum
Parrot Bebop 2
DJI Phantom 4 Pro
If you are…"
"If you just want to make a gift for your son and this is going to be his first drone, I'd recommend you to choose DJI Spark. This is the latest selfie drone, released by DJI a month ago. I bought ir for my daughter from www.aeromotus.com and…"
"http://copter.ardupilot.com/wiki/introduction/ has some good info
Get a small one like a Hubsan X4 and learn to fly first, then fly a bigger one. It best to learn fly as its much cheaper to crash and repair. If you don't like the idea of…"