If you want to buy a book, you should buy it on mainstream e-commerce platforms such as Amazon, Taobao, and Jingdong. These websites have a wide variety of books, and the prices are relatively transparent. They also support online reading and ordering. If one wanted to buy an electronic version, they could search for the corresponding keywords on these platforms to find the latest edition of the book and then download the electronic version to read. In addition, if you like to read in the library, you can also find books of interest on the local library website and buy or borrow them online.