There are always 3 lights in a scene.
2. Camera Light
3. Ambient light
This tip will talk about ambient light.
Ambient light is luminous from everywhere. Ambient lighting provides an area with overall illumination.
You can change the ambient 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.