The first question that pops out in the minds of SEO beginners is how Google ranks a site. Over the course of years, Google has changed the way how they evaluate the ranking of each site. The way they indexed sites has upgraded from time to time. As a result, the way SEO experts offer their SEO packages has also changed many times.  

Currently, their data base has expanded and became more accurate when it comes to detecting spam and questionable content.  

The video below shows you a comprehensive explanation on how indexing and other ranking factors have evolved over the years.
 

Matt Cutts explain how Google’s ranking and website evaluation process works starting with the crawling and analysis of a site, crawling timelines, frequencies, priorities, and filtering process within the databases and etc.  

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