There is a multitude of ways to trace depending on the medium you use and the material you are tracing on, however, the easiest and most versatile way is to use tracing paper. Simply place the tracing paper over your reference image and use a pencil to trace along the lines. You can then transfer the outline of your design from the tracing paper to your material by either flipping it over and drawing over the lines with a ballpoint pen or laying it on top of carbon paper on your canvas or page and going over the traced lines again.