Direct sunlight can be helpful for photographers in many ways. Its brightness means that you can shoot with fast shutter speeds that reduce the chances of blurry pictures. And when you encounter shadows from objects and people, bright light helps create contrast. However, those high-contrast situations can pose a range of problems that can detract from overall picture quality; learning a few tips, though, will help you exploit bright light to your advantage.
If you're shooting portraits in bright light, you'll encounter harsh shadows on your subject's face, squinted eyes, and other challenges. Putting the sun behind your subject eliminates squinting, but you'll probably still see unflattering shadows. This is a situation where using fill flash will help reduce shadowing and put your subject in a better light. Most camera's let you adjust flash brightness, so experiment until you've learned to reduce shadows without overexposing facial features.
Alternately, you can move your subject into a shady area where the light isn't so harsh. You may see a very bright background, though, that fools your camera's light meter into underexposing the picture. This is another case where fill flash may be very useful.