Drag the light (white dot) and the object. Turn on Labels if you want the parts named.
This is not from the white dot. It’s the general “room light” (like sky light, bounced light, or a lit room). Higher ambient = fewer deep shadows.
Also not from the white dot directly. This simulates light bouncing off the ground/walls back into the shadow side.
This is about the white dot: small light = sharper shadows, big light = softer shadows. (Think “bare bulb” vs “big window”.)