Move the light towards or away from the subject to vary the brightness of the subject relative to the background and vice versa

If you want the background to be brighter and more pronounced relative to the subject of your photographs, then morve the light source further away from the subject. This follows from the failing away phenomenon described above. 

On the other hand, if you want the subject to be brighter than the background, then move the light closer to the subject- light will hit the subject first beffore falling away a bit then illuminationg the background.

The greater the angle between the light source and the subject, the more texture is enhanced. 

Generally speaking, front-lighting suppresses texture, light from above , below , or to the side enhances it, If you specialize in portrait photography, then you will want to keep your light source aligend with the main axis of the lens in order to conceal wrinkles. 

By contrast , if you are a landscape photographer, you may prefer side-lighting as a way of emphasizing the textures of the natural environment. 

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