The card is free, and you can read books (or use your ID card), but the card has a card number and password, and you can log in to Guo Tu's computer. Guo Tu officially manages its own reader information.
If you want to borrow books, read ancient books and other value-added services, you have to pay more. The specific national map of official website is explained, and it is also explained when filling out the form.
Borrowing a book is to open that service, pay a deposit of 100 yuan, and return it when returning the card.