Google has released a general guideline and tools for SEO (search engine optimization)
User, who has interest, may download the PDF and have a look.
For references –
Google’s Search Engine Optimization Starter Guide
http://static.googleusercontent.com/media/www.google.com/en//webmasters/docs/search-engine-optimization-starter-guide.pdf
Google Webmaster Tools
http://www.google.com/webmasters/tools
Webmaster Guidelines
https://support.google.com/webmasters/answer/35769
