An understanding of photography composition will help bring emphasis to your selective focus. These same principles apply to many visual arts and are true of graphic design and fine art — they apply whether you are using a digital or SLR camera.
Composition is how you arrange visual elements in your photo, including the main subject. All the technical know-how, like understanding ISO or shutter speed, may help you capture nice exposures, but composition knowledge will help you pull the viewer into your image. “Things that I always look for are light, composition, and subject matter,” photographer Andrew Griswold agrees. “You can get a good image with one or two of those things, but when you blend all three of those together perfectly, you get a great image.”
These elements of photography composition will help you capture the story you want to tell in a portrait or landscape orientation, and many are applicable whether your images are color or black and white.