First of all, you should be clear about your needs, whether it's novels, poems or popular science, you can't buy everything aimlessly. Secondly, in the face of similar books, we must look at publishing houses, because it is easier to publish books now than before, so it is inevitable that the quality of some books is not very good, that is, in ancient literature, the better ones are Zhonghua Book Company Press, Shanghai Ancient Books Publishing House, People's Publishing House and so on. Third, it depends on who the author is, and of course it is authoritative. But reading should also be treated dialectically. Authority is not absolute. We need a pair of eyes to find problems. Finally, I think we should pay attention to practicality. If it's not a gift, it's cheaper to buy paperback books, and you can save some money to buy more good books!

Personal opinion, for reference only.