One of the biggest and best tips that I could possibly give any photographer about modern digital photography has to do with metering a scene. First off, if you're using a form of evaluative metering then you should often use the light meter as a gauge and not try to always get the little blinker in the middle of the exposure indicator.
You personally may want an image to be brighter, so learn how your camera handles more overexposed photos. . thephoblographer.com