There are three basic settings in digital photography that every photographer needs to know and understand: exposure, aperture, and ISO. If you can fully understand the effects of each on your pictures you will greatly expand your possibilities and quality of your shots.
Don’t Be Afraid of the M
Most camera’s today come with several preset modes to choose from and most of them do a good job for their intended use, but to get more out of your camera and to push your creativity, you really should explore the M or Manual mode. Don’t be afraid of the M, with digital photography if you mess up its ok, just delete the picture, make some adjustments and try again. Manual mode gives you full control of how you want the picture to look. You may want to have a silhouette of an individual, but if you use the Portrait mode your subject will be lit, that’s why you use Manual mode instead.