Distinguishing between objective fact and subjective opinion. Some things will be objectively wrong, but often, likes and dislikes will just be a matter of taste or personal preference. Everyone has their own opinions on any given thing, and opinions will not always line up. When critiques come in, you have to identify things that have merit, and things that are just a matter of personal taste.
The over-ordering of books by bookstores, and how they 'dispose' of them. Bookstores will over-order, then get refunded on the units not sold. But those units do not get sent back or discounted; they get tossed in the trash. It's such a waste of paper.
