http://moz.com/blog/the-web-developers-seo-cheat-sheet-2013-edition
http://moz.com/beginners-guide-to-seo
http://moz.com/google-algorithm-change
http://moz.com/search-ranking-factors
http://moz.com/blog/the-beginners-checklist-for-small-business-seo
http://moz.com/blog/how-to-rank
http://alexmiller.com/the-students-guide-to-search-engines/
https://blog.ahrefs.com/little-blue-book/Little-Blue-Book-by-Ahrefs.pdf
http://seosherpa.com/seo-experiments/
TOP SEO SITE:
1. Moz
2. Search Engine Land
3. Search Engine Watch
4. Occam’s Razor
5. Content Marketing Institute
6. Search Engine Journal
7. SEO by the Sea
8. CopyBlogger
9. Blind 5 Year Old
10. Rand Fishkin
11. SEO Book
12. Matt Cutts