Because some physical bookstores don't have all the textbook types, and Taobao, as a national shopping platform, has a very comprehensive collection. For example, if you can't buy a book in a physical store, or the book you need is out of stock, you can choose to buy it on Taobao. Remember to distinguish between genuine and pirated books when buying. Generally speaking, the flagship bookstore is the genuine one. I hope this helps you.