The three principles of exposure: ISO, Shutter Speed, and Aperture. All of these elements of photography are used to create photos that look their best.
Shutter speed is crucial. A high shutter speed will freeze time in place. When a low shutter speed will capture motion in a single frame. This is used when you are trying to capture something in motion as a crisp and still or convey motion in your image. However, higher shutter speeds do not allow the camera as much time to let light in, darkening your shot.
This is where aperture comes into play. Adjusting the aperture can make a shot lighter or darker by letting more or less amounts of light in. Additionally, aperture affects the depth of field. This means that a higher aperture gives a wide range of focus, and a small aperture gives a small range of focus or focal point.
ISO is the least important setting, however it can still help. ISO is the cameras sensitivity to light. Adjusting the ISO will make images appear brighter, and your camera will soak up light. One downside of using ISO is that higher settings can incorporate a lot of "noise" into your photo. Noise takes away from the quality of a photo.
