Google’s SEO Starter Guide

Straight from the horse’s mouth, some general tips for SEO. Good stuff!

Webmasters often ask us at conferences or in the Webmaster Help Group, “What are some simple ways that I can improve my website’s performance in Google?” There are lots of possible answers to this question, and a wealth of search engine optimization information on the web, so much that it can be intimidating for newer webmasters or those unfamiliar with the topic.
Official Google Webmaster Central Blog: Google’s SEO Starter Guide