The shutter speed you use when taking photos of a scene plays a key part in capturing a movement in your picture. The faster the shutter speed, the sharper the focus will be. While, a slower shutter speed is going to blur to an object in motion. You can adjust your aperture, if you shoot a photo with a shallow depth of field it wouldn’t be easy to get your main subject to focus. If you blur the background with the subject in focus, the photo will be better.