ISO- the ISO is the sensitivity of the camera to light. The higher the ISO the more light that is let it giving a light or sometimes to light picture so it either becomes or turns white.
Apature – The apature on the camera is how much light the camera is exposed to. The smaller the apature the more light the camera picks up on. wereas having a higher apature lets in less light and you will find yourself with a darker picture.
Shutter speed – When you have a fast shutter speed the picture becomes very sharp and taken quickly just like freeze motion. However, if you set your camera to have a slower shutter speed you could find yourself with a subject blur because more light is let in. Occasionally with a slower shutter stand if the camera is not steady you can find yourself with a picture that has been taken ‘shakily’.