Anyone can learn how to create Islamic geometric designs. It does not require an aptitude or even enthusiasm for mathematics or geometry. Understanding how geometrical designs are constructed gives an artist the tools and insights that are needed to create geometrical designs. So, if you can understand how a design was made, you can put yourself in the shoes of the traditional craftsman and learn how to create designs in the way it has been done for centuries.
All that is  required is the ability to draw circles and straight lines. Traditional Islamic  geometrical design is based on connecting intersections between circles and lines. This website offers an extensive 'LEARN' section on the practical aspects of traditional design.