All of the resources are available for basic Blender things for games: Uv’s, Rigging, Modeling, Animation. The things that are most valuable for people starting out with unreal is understanding how everything works. I have had no problems going from Blender > unreal/Unity. The Fbx exporter is not broken, the way you model is in relation to the scaling of the OBJECT (You need to apply transforms for the scale to change (CTRL + A)). However, face normals and averages are what I’m struggling with. Also wouldn’t mind knowing how cloth, hair, Ik would work 
(Also for my sanity, make .Blend files readable in UE4+ please).