1. Book quality: The quality of the same book on different platforms may be different due to the differences in purchasing methods and suppliers of different channels. Therefore, before buying, it is best to check the evaluation and feedback information of the book and choose a merchant with high credibility.
2. After-sales service: Even if the purchase process is very smooth, there may still be unexpected situations in logistics, distribution and mailing. In this case, after-sales service becomes particularly important. Different platforms may have different policies and handling methods for after-sales services such as return and maintenance. Therefore, it is also recommended to consult the after-sales policy of the platform before purchasing.