Getting into Haxe and Air can be tough since all the content is on a myriad of different websites. Here is a nice little list of useful websites that will help along the way. It is by no means complete and only aims to give the most important links.

Adobe Air

Air SDK Download
Air SDK Beta Download

Starling (Fast Render Library) Forums
Air Development Forums
Air Bugs and Performance Issue Forums
Action Script 3 Forums in Animate CC
Air Beta Forums

Facebook Action Script Group
Facebook Stage3D Group


Haxe Forums
OpenFL Forums
Haxe Libraries