I have been to Hero Mountain Cave, where there are not many books for self-study. Now I'm going to buy a self-taught book or go to the self-taught office, asking for a complete book and a correct version. In addition, there is a Dashun bookstore in the north of the intersection of Huayuan Road and Erhuan East Road, where I study books by myself.
Bookstores in other places have never seen a complete set of self-study books.