There are a few key things that make a graph successful. The first is that it must be accurate. This seems obvious, but it is important to make sure your data is correct before you start creating your graph. The second thing to keep in mind is that your graph should be easy to understand. This means using clear and concise labels, as well as choosing a graph type that is appropriate for your data.
The third thing to remember is that less is more. This means using minimal colors and shapes, as well as avoiding unnecessary elements such as 3D graphics.