What are the 3 most important factors for SEO ?

The three most important factors are: links - Content - Rankbrain

A very important piece of information for the first time we hear 

from someone who works at Google, of course, there are many other factors used by Google and are playing a role in the arrangement, but that the permission of the person who comes from within Google are three factors that are used the most important in the standings, this is rare, on the whole if you who follow the SEO must you know the meaning of each of these factors, linkages internal tribunals and foreign take them a lot and a lot of articles and explained how to use them and the mistakes that you should not commit when we involve links your site, look in the SEO for internal links and external links and you'll find a large amount of articles on the subject, the content, and what you know what the content, the content is king and the importance of unique content and is copied and updated constantly essential element to improve rankings in the search results, for of Rank Brain is intelligent Artificial based on the principles of artificial intelligence to assess the site and determine its ranking.