Algorithms For Dummies

  Getting the Right Web page 

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(made by MOZ, a U.S. company). You can also download the yearly reports from 

http://www.searchmetrics.com/knowledge-base/ranking-factors/

, 

by Searchmetrics, a German company from Berlin specializing in SEO software.

You must also consider that the Google algorithm has received many updates, and 

at this point, it’s more of an ensemble of different algorithms, each one named 

with  a  fantasy  name  (Caffeine,  Panda,  Penguin,  Hummingbird,  Pigeon,  Mobile 

Update). Many of these updates have caused shake-ups of previous search rank-

ings  and  were  motivated  by  the  need  to  fix  spamming  techniques  or  make  the 

surfing the web more useful for users (for instance, the Mobile Update induced 

many sites to render their interfaces mobile-phone friendly).