What does "Nine Star Peak" refer to in Feng Shui?

All kinds of mountain peaks in nature are classified into five shapes, five grids, and five stars of metal, wood, water, fire, and earth in Feng Shui writings. In fact, the characteristics of the mountains are classified into five shapes. Because there are many versions of the nine-star theory for regulating qi in Feng Shui, Luan Tou Xueshu subdivided the five stars into nine stars. The nine shapes and characteristics evolved into the nine auspicious stars and the nine unlucky stars on the mountain peaks. Finally, it was like the Tang Monk in Journey to the West. It is the same as the 981 difficulty, but has evolved into the variant shape of the 9981 mountain. There should be more books like this, and they also include graphics, but the concepts and shapes are not accurately described, making it difficult to master and easy to get confused.