Depth of Field
Working with a different depth of field can really change the feel of your pictures. Using a shallow depth of field or a wide aperture will blur the background of the picture. The blurred background puts your subject as the focal point of the picture. This is great for portraits of sports photography. Most cameras have an aperture priority mode which will allow you to work with depth of field without have to worry about anything else. Using an aperture of 3.5, 4.5, or 5.6 is a good place to start.