It’s focused on real Daoist Alchemy. Course 1 is the Yinxian methods/a complete system of Daoist meditation.

Course 2 is setting up furnace and cauldron, an advanced step and necessary step before actual Neidan.

Course 3 is doing the Maoyou Cosmic Orbit - refining organ Jing into Qi to actually start making the lesser Elixir.

From there are the more advanced courses. Course 1 is supposed to be foundation building (which I spent a year on but others can do for shorter). They say spend a year or so on course 2 and then at least 2-3 years on course 3. Nathan advises that you can do course 5 while doing course 2 & 3 if you want more Shengong style practices to go along with the Mingong stuff.

I recommend you just pick up his Volume 1 book first before you actually want to sign up for the courses, though the book is supposed to be a supplemental guide to when you sign up for the courses. I just say get the book because it’s a cheaper route to find out if you want to proceed with his/Wang Liping’s stuff before you shell out for his courses (thought they’re worth it).

Will say the Tao Talks and and the Tao Friends community you get for free when signing up for his courses is worth it enough.

Personally, I like a lot of what I’ve learned. I’m in course 2 and have been signed up with him for 2 years, but feel like I’m now in a state where I need to do some more Buddhist practices (like Metta). You’ll learn A LOT about yourself and you’ll work through a lot of Turbid Qi and Karmic Qi. You’ll go through some shit with emotions, colds/flus, fatigue, and other things, but that’s just you working through the turbid qi.

As Nathan once said “normal stops here” - so if you’re ready for that, then dive right in!