Every week Quora will mail you questions and answers which you might be interested in. In my inbox just arrived Aaron Wall's answer to the question "What's the most awesome SEO material I can lay my hands on?" Aaron and I go back a long way and I'm always interested in what he has to say about SEO, so I clicked through.
Aaron Wall of SEObook: would you take SEO advice from someone
living in a trailer park. In the case of Aaron Wall, mostly yes.
I was astonished at how facile and amorphous Aaron's answer was, apart from the first sentence (which is a very important distinction). Enough to comment on it and write this post.