Lighting Tricks for UE4?

Hello,

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?

Hi!

Maybe they are a bit out of date but still (one of the) the best lighting tutorials!
https://forums.unrealengine.com/community/community-content-tools-and-tutorials/106867-unreal-4-lighting-academy-or-something-like-that