What does the camera mean when shooting with sidelight and full light? How to divide it?

Total light, also known as front light and smooth light, refers to the light with the photographer's back to the sun, that is, the light coming from behind the camera. Because all parts of the subject are bathed in direct light, there is light everywhere in the part facing the camera, and the result is an image without tone levels. It may not look good to pat your face with positive light, especially with high positive light. Side light, that is, light from the left or right side of the scene, forms a horizontal angle of about 90 degrees with the scene and the camera. This kind of light can produce obvious and strong contrast. The shadow is slender and expressive, the surface structure is very obvious, and every tiny bump produces obvious shadow. Using sidelight photography can create a strong modeling effect. Backlight refers to the light coming from the opposite direction of the camera. White light outlines the edge of the scene and creates a sense of depth. Backlight shooting position and angle of view can make the picture crystal clear, fresh in color and full of vitality. Using backlight to represent the scene can enrich the tone layer of the scene. The front light is also called oblique light, and the direction of light projection forms a horizontal angle of about 45 degrees with the scene and camera. This light appears at 90 o'clock in the morning and at 3 or 4 o'clock in the afternoon. This kind of light is more in line with people's visual habits in daily life. Illuminated scenery, the projection falls on the inclined side, there is obvious difference between light and shade, which can better express the texture of the scenery.