I remember a long time ago maybe 10 years ago someone asked what makes someone a Qigong teacher, what to look for in a Qigong teacher, what concepts should a teacher be teaching. I have always said the most important concept in Qigong,Waigong, Neigong, Neidan, Waidan, Daoyin, even in studying more esoteric arts such as 符籙, and other Daojiao 道教， San Bao三寶 will always be the most important concept. Understanding San Bao and having a solid foundation in the theory of it will allow you to build onto more advance practices. A teacher should know the Jingluo 经络 and Jingluo theory. A teacher should know Kan and Li 內丹术 and Yin 陰 and Yang 阳 this is especially important in learning Neidan. Tiao shen調神，Tiao Xin調心，Tiao xi調息 ，Tiao Jing 調精，Tiao Qi 調气，all these catagories deals into further catagories such as weiqi 衛气 zangfu 脏腑，Yi and Xin 意,心 a Qigong teacher should be able to discuss. In the more Alchemical levels a teacher should be able to explain the symbolism used, and be able to identify what a student is feeling if it is correct progress. Qigong Masters should also know the seasons and influence on a person as written in the classics, They should know how to predict auspicious days according to the Yi Jing. I write this for those trying to grasp deeper Qigong concepts and what makes a good teacher so a student has the right foundation. Some people are simply looking for a waigong form and some teachers that is all they know such as BaDuanJin八段锦。 Just some thoughts on the subject.