Good news for website developers, SEO pros: Google released a 160 pages pdf about its Search Quality Rating Guidelines.
According to Google’s statement:
“We often make changes to the guidelines as our understanding of what users wants evolves, but we haven’t shared an update publicly since then. However, we recently completed a major revision of our rater guidelines to adapt to this mobile world, recognizing that people use search differently when they carry internet-connected devices with them all the time.”
The manual includes information about web as well mobile SEO.
Download the “General Guidelines” 160 pages PDF, Google Inc, November 2015.