In SEO , Google’s ranking factors are the stuff of legend. There are rumored to be more than 200 signals which inform Google’s rankings (although this statistic originated in 2006, so it’s probably safe to say things have changed a bit since then), and the exact factors which make up this list, as well as their order of importance , is the subject of perennial debate. While we at Search Engine Watch can by no means lay claim to a complete list of Google ranking factors (and anyone who says they can is lying to you – yes, even if they’re from Google, probably), we’ve delved into the subject a fair bit.
The rest is here:
An in-depth guide to Google ranking factors