Are you completely new to SEO? Do you feel you need a basic run-down of what it is all about? If so, you should check out Google’s SEO Starter Guide. It covers such topics as page structure, meta tags, title tags, robots.txt files and more.
Direct PDF Download (560kb): SEO 101 From Google
The Blog: http://googlewebmastercentral.blogspot.com/2008/11/googles-seo-starter-guide.html