You can learn that; it’s a lineage method. Michael Saso, the Jesuit priest who converted and became a Taoist priest, learned it and told me it works powerfully. But he told me there are only a handful of people left who know it. It is complicated for Westerners; you probably need to learn Chinese. I personally decided my time was better spent practicing nei gong than learning spoken Chinese.
My alchemical tradition works with the polarities of qi in nature and with the natural shen, which manage the natural flow of qi. You can directly tap the energy of the sun, the moon and the stars, volcanoes, water, wind and rain. All of these are natural forces and they are all represented microcosmically within your body. You can resonate those outer forces into your body and do all this work right inside your body without invoking any particular deities other than the natural shen, the spirits that are living inside you and which are connected to the natural spirits that run the body of this universe. Spirits don’t occupy any physical space. That’s why it is possible to unite an entire universe of spirits "inside" the microcosm of your body. I have no problem with people having connections to religious deities or special guides or anything. Those often appear and people maintain whatever alliances they want to. The principle is what counts, and the efficacy of one’s method. How do you work the different levels of polarity—of water and fire, yin and yang? How do you grasp the essence and open the mysterious gate, the "hidden period" or timeless state, and enter into it?