Ever wonder why your Unreal Engine 5 scenes look harsh, flat, or completely lifeless? The secret to realistic lighting isn’t adding more lamps—it’s mastering the Sky Light. 
In this absolute beginner’s guide, we fix the pitch-black “moon shadow” problem. Learn how to make your ambient lighting behave exactly like the real world.
https://dev.epicgames.com/community/learning/tutorials/PeEL/unreal-engine-5-the-ultimate-sky-light-beginner-s-guide