I just started and i have no idea how to fix this shading problem.
Plz help me
I have the same problem 
Found this, maybe it can help: select the landscape and untick cast static shadows, also there is a few lighting settings to change, just follow: ARK Dev Kit Lesson: Adding Terrains - YouTube the part about the lighting as it seems you have already added the terrain is from around 2 Minutes in the Video 