Having obtained perhaps one or two belts, students quit.
They leave with the mistaken impression that they know far more than they do about the art they are studying.

In truth, even after several belts, knowledge remains superficial.

Most martial arts feature approximately 10 coloured belts.
These serve to lay the most simplistic foundation for the training to come.
They cover the basics, and nothing more than that.

To imagine that a beginner is anything more than a 'beginner' is incredibly naive.