The rule-of-thirds is a simple way to create interesting compositions using no complicated camera settings. This divides your image horizontally and vertically into nine equal parts. This creates three main areas for your subject to appear. These are the top (3rd from the left), middle (3rd from center) and bottom (3rd from lower right). You can use these areas as guides for positioning your subject within your frame.
The rule of threes can also help you avoid placing important items too close together. If they are too close to each other, it may be difficult for them to make a strong visual impression. They may lose focus if they're too far apart.