Some guys trust everything that they read about SEO. Come on! You don't have to do it. First of all, the SEO science (SEO art) is not that simple and not that transparent! Even some high-educated software engineers don't know many of the SEO secrets. Nowadays so many guys, online, are trying to write about SEO or even to offer to you their SEO SERVICES. But you have to know that there are different levels of that SEO knowledge and SEO ethics.
Look, everyone can write somewhere, something "SEO". But you have to be careful. How? Just FIRST read the official opinions about SEO (Search Engine Optimization) and then, when you get some level, you can try to read some un-official ones and to think about it all. One of the most important SEO-skills is to be able to make difference between white hat SEO (the legal one) and the black hat SEO (the illegal one). Otherwise you'll get a lot of troubles.