The 10 Most Common SEO Mistakes

6. Poor titles and headers - Keyword tools are wonderful weapons. These are valuable for far more than SEO. Keyword tools tell you what language people use when referring to your products and services. Even in a world without web sites, this is something you would want to know. Then you need to make sure you have pages and content that addresses the major topic areas that relate to your business.

Read the entire list and learn a little which can go a long way.

Link:
http://blog.searchenginewatch.com/blog/071116-103407