When is it advice based on fact vs. an opinion from your own little mind? There are a zillion books on writing, editing, and selling. Don’t stop there. Look at all the parenting books and books on finding your soul mate. So out of all these books which ones are really helpful and which are simply a string of opinions that worked for one person. We are not cookie cutter. Just because Author A got published without editing a single word doesn’t mean Author B can do the same. Just because your child responds to time outs doesn’t mean that another child will. Now the book/movie, He’s Just Not that into You, might actually have some legs to stand on.
What self-help or instructional books do you rely on? Writing, parenting, dating or otherwise. I personally like Dr. Sears books for child rearing and my own personal gut of course. I have yet to find a query letter book that is perfect, but The Guide to Query Letter’s isn’t bad. The Element of Style for basic grammar isn’t all that bad either – are there better? I guess it depends on who you ask.