Ancient people liked to separate schools. Which school does Guiguzi belong to?

Guiguzi is a Taoist and often lives in seclusion in the mountains.

Introduction to Guiguzi:

Wang Xu, also known as Wang Chan and Guiguzi, is a mysterious legend in history and was born in the Spring and Autumn Period. He often goes to Yunmeng Mountain to collect herbs and cultivate monasteries. Because he lives in seclusion in Qingxi Ghost Valley, he calls himself Mr. Ghost Valley. A famous thinker, strategist, strategist and educator during the Spring and Autumn Period and the Warring States Period, he was the originator of military thoughts and a mysterious figure in the history of China. He is known as a romantic figure through the ages. He is good at maintaining a healthy body, being good at psychological speculation, knowing the trend of combining rigidity with softness, and being familiar with the art of vertical and horizontal coitus, with unique wisdom. His disciples are military strategists: Sun Bin and Pang Juan; Military strategists: Su Qin and Zhang Yi.