The heart of a photograph is its composition—the position of different elements in a frame. The easiest rule of thumb to learn and remember is the Rule of Thirds. Basically, you'll want to break your frame into nine squares of roughly equal size. Try and align the subject of your photo along these lines and intersections and imagine the main image divided over these nine boxes. This gives you a more dramatic, visually interesting shot than one where you subject is located dead center. Many newer cameras have a rule of thirds grid overlay that you can activate when shooting.