For good reason, Google (ditto other search engines) makes SEO as impenetrable as possible. Unfortunately, that makes it difficult to disprove anything a self-appointed SEO says. Honest error and charlatanry both follow apace. I'm seeing the same thing in the world specifically of Amazon search rankings, as self-published authors strive -- perhaps not wrongly -- for high Amazon rankings without knowing either how to…
And some SEO types are clearly scumbags. Some stuff is clearly, unambiguously, bad.
So, how are naive users supposed to tell the difference between honest decent SEO types, and sub-optimal but not clearly evil SEO types?