Best Resources for SEO Basics (2013)

I want to thank everyone for your replies! I'll definetely check out your suggestions

In the meantime I could add another option that I found useful today: http://www.nichepursuits.com (Spencer Haw's blog, the creator of the Long Tail Pro keyword research tool)

Now I realize that SEO training is all about reading content here and there over the web and then making your own criteria (since there are tons and tons of information out there and in most of the cases one "technique" contradicts the previous one )

But what it seems to be kinda universal law of SEO is to test by yourself.

Any other valuable suggestions you might add?

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