Hourences is an indie developer who made the game "The Ball" with UDK. Anyone who looked through the sample indie projects from the UDK website would remember it. Anyway, He also does UE4 tutorials and has been using the UE4 Engine for the last year. He charges for his tutorials though which sucks, but they seem to be pretty high quality as well. So it's hard to argue with that.
His website:
http://www.hourences.com/thesolusproject/
This is a video series of him covering how he is quickly and efficiently building his game world. These videos are freaking gold.
Video 1
http://youtu.be/rxM6QVwrzBg
Video 2
http://youtu.be/KDOhBMaa6Vs
Video 3
http://youtu.be/IXpyFxf66ac
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