1. Iso: A measure of a cameras sensitivity to light. Set this first depending on the light or darkness of the room/location. Keep as low as possible. Use the shutter speed and aperture to get as much exposure as possible.
  2. Shutter speed: Fast if its bright or sunny outside, slow for darker rooms to allow more light to get in as its exposed a longer period of time. Slow shutter speed and movement can also create a blurred effect in the direction of the camera movement with bits of the image doubling over each other.
  3. Aperture: The measurement of how open or closed the iris in the lens is. It controls the depth of field. If you increase this then the camera will focus on closer objects, this is good for shooting people with a far away backdrop or interviews.