What books should I read if I want to teach myself six predictions without basic knowledge?

You can look at some of Professor Liu Dajun's works on the Na 'jia order method. Wang's Authentic Divination and Ye He's Modified Divination are also introductory classics. These books are available on Confucius Old Books, Dangdang and Joyo. Self-study is very hard, so it is recommended to find a teacher for guidance. All six books have great limitations, or mistakes, many sects, mutual criticism, and people are at a loss. To find a teacher, whoever has the highest accuracy will learn from him.