There are always 3 lights in a scene.
2. Camera Light
3. Ambient light
This tip will talk about camera light.
The camera light is the light that is always facing the object in the scene from your point of view.
You can change the camera light to different colors.
Below are a few examples.
The dog is in front of the dog house. the ground is grass. there is a house 2 feet behind and 2 feet to the left of the dog house. the house is facing southeast. the ground is unreflective. there is a ball in front of the dog.