Lighting Tricks for UE4?


I am new to UE4. I watched some tutorials online and I am trying to construct my first scene by using the Open World Demo Collection.

I put some trees and grass, then I hit the build button. However, I got very bad graphics quality.

All my foliages become very black and it seems there is no indirect lighting.

How can I make the quality as good as the example images?


Maybe they are a bit out of date but still (one of the) the best lighting tutorials!