Sometimes, a great photo is a chance event; the light, the subject, and your camera all behave just right, and magic happens. More often though, great photography is the result of careful planning and preparation. Look at other photos for inspiration. Think about what you want to capture about your subject, and what the best way to do that might be. Is this wedding shoot going to be bright and fun, or dark and romantic? How will that change your lighting, your focus, your lens selection. If you answer to these questions before you start shooting, you are much more like to get the photograph you imagined.