I should say something when I see this post here these days.
To learn Zhouyi, we must first understand whether to learn Zhouyi or academic mathematics.
Zhouyi is a book, and there are no eight characters, six hexagrams and strange doors in it. But the book Zhouyi expounds a principle: the theory of yin and yang. Another theory: gossip theory. However, if you want to know people's fate clearly or predict the success or failure of something in advance, reading Zhouyi is of little use.
If you want to learn eight characters, you can buy introductory books at the bookstall, and there are many. But to buy a book that I have really studied, I haven't seen it yet
The same is true of Liu Yao. If you want to learn, it is enough to add or delete a book about the old man with wild cranes. If you really want to learn, there are many sects at present, and you won't know how to choose! But I think Rao Yixian's six-point theory is the best one I have seen recently.
I've learned a lot about Wei Zi Dou Shu, but I haven't studied it deeply enough to discuss it.
There are also many strange sects. You need a hundred schools of thought to contend, and only by comparison can you gain something.
Those who are interested in learning six hexagrams, eight characters and strange doors can learn from me and pay tuition. I love money too. But I can let you know that you didn't get it for nothing after learning it. Value.
My blog explains this in detail.
By the way, if you have attended other training courses, you will know better that it is right to learn from me.