Consider your capabilities, limitations and interest in photography.
Consider the situations and occasions you generally use to take photos and select suitable camera accordingly.
For the beginner, low-cost point and shoot digital cameras are suitable. Set the camera to auto mode and frame the subject. The camera makes all the adjustments for focus, aperture opening, shutter speed, etc. Auto focus features are important, but a camera with manual focus features can give greater flexibility.
To take snaps on sports events, one need a versatile, full featured camera, with zooming, light adjustment, etc.
Be sure to shop around before actually buying a camera.
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Useful Shopping Tips: Tips for Buying Digital Camera