2012, the year in which the rules of the game changed, when Google adjusted its taps and thousands of websites saw how the visits that came from the search engine fell day after day, many of them penalized for bad SEO practices.
From Capybara SEO, who already translated the MOZ Beginners SEO Guide in 2013, they present us with a free PDF book that tells us what happened that year and how it affected the web. Your title 29 SEO experts talk about 3 years of Google Penguin updates, and you can download it from seo.pe.
They have done it in collaboration with LinkResearchTools.com, and they explain the problem of doing SEO in a traditional way and the safe methods with which we must work to obtain a good position in the search engines.
In the book, 29 industry experts discuss their experiences with the algorithm and how it changed the way it works after its implementation.
Black Hat techniques used by aggressive SEO, overseas SEO outsourcing, algorithmic updates vs. manual actions, massive social bookmarking, evil Black Hat, link pyramids and link wheels, how to recover from Google Penguin, Google Penalty Recovery stories , secure link building in 2015… a 100+ page guide worth reading.