The 3 Points of lighting are Background Light, Fill Light and Main Light.
Background light is a light used on the background to separate the subject from the background so it does not look so flat. The subject stands out more.
Fill Light is the light used to reflect the light coming from the main light to reflect the darkest side of the subject. It is used as a reflector.
Main Light is the light used to light up the subject. It is usually positioned on the side of the subject. It uses the key triangle which is a triangle of light on the darkest side of the object.
