The absent part to make UE4 most desired – 500 fast FAQ with short tutorials (text/audio/video).

Here are my first 3 suggestions for absolutely necessary tutorials and top FAQ:
1.POM with Silhouette (work in 4.7, not work in 4.8)
2.Blend (transit) the intersection side/edges of two objects (like hellblade blueprint script here )
3.Blend (transit) the intersection edges of neighbour material slots of one object