Personally, I suggest learning Wu Huaiyun's textbook, authentic prediction of Yin-Yang, Five Elements and Eight Characters. Wu Huaiyun, a controversial figure, died in the 1990s, but his basic teaching materials are the best, from shallow to deep, and he is very graceful. He will also tell you some ideas about the new school. In 1980s, the numerology research in Taiwan Province Province and Hongkong was at least 10 years ahead of that in mainland China. Now I'm learning, too. It was recommended by a friend of mine who studied eight characters. You will understand it after searching, and you will understand it after reading it. You can buy this book on Taobao or I can send it to you. Also, I recommend that you have a little foundation, and go to see the classics such as the Children's Fair to recharge your batteries. Ancient books must be read.
I'm already on your Baidu hi. You can leave a message for consultation.
Well, it suddenly occurred to me that you asked about the study of the Book of Changes ... In fact, the study of the Book of Changes belongs to academic research and has nothing to do with fortune telling. Just now I thought you were going to learn eight-character fortune telling. In the study of the Book of Changes, we should first read the Book of Changes, use our own understanding to understand the original text, and then appropriately absorb other people's research results. Another "learning" of the Book of Changes is divination. There are different ways of divination, some based on divination and some based on hieroglyphics. You need to see for yourself. I don't particularly understand this. If you want to know, you can indicate that the topic depends on the academic research of Yijing.
I have seen the Zhouyi Jianghu mentioned earlier, which introduces some methods of divination, the method of promoting gown and so on. It also introduces the difference between the current copper robe and the previous one. However, if you look at my understanding of Zhouyi now, you will understand that reading this book can only be used as a leisure reading. I'd better read the Book of Changes by myself.