Exposure Compensation: An Easy Guide
Raise a hand if you spend a lot of your time in your camera’s auto modes, Program, Shutter or Aperture Priority or even Scene Modes. Keep your hand raised if you would like to shoot manually, but either A, Do not have enough time to set it up or B, still a little perplexed by manual exposure. If you have answered yes to either of these questions, perhaps its time to look at exposure compensation, the easy way into manual exposure.
Understanding Exposure Compensation Tutorial