Buying a physical book or reading it online depended on one's personal preferences and needs. If you like the feeling of a physical book and prefer the physical characteristics and touch of a physical book, such as the weight when flipping through, the texture of the pages, etc., then a physical book may be more suitable for you. In addition, if you want to look at the details in the book or pay special attention to certain parts, the physical book can also help you. If you like the portable and re-read nature of e-books, then e-books might be more suitable for you. E-books can be read on any device and can be deleted or replaced at any time. It is also easy to search and filter content. Whether you choose a physical book or an e-book, you should decide according to your own needs and preferences. At the same time, he could also compare the contents of books on different platforms or websites to find the most suitable reading material.