If you own a website, having an account with Google Webmaster Tools is invaluable. It can provide you with a wide variety of information about your site, its traffic, and how Google perceives it. In particular, webmasters just starting to learn SEO have many questions, and Google Webmaster Tools has the answers.
http://www.seochat.com/c/a/Google-Optimization-Help/SEO-FAQ-Answered-by-Google-Webmaster-Tools/