* Avoid hidden text or hidden links.
* Don't employ cloaking or sneaky redirects.
* Don't send automated queries to Google.
* Don't load pages with irrelevant words.
* Don't create multiple pages, subdomains, or domains with substantially duplicate content.
* Don't create pages that install viruses, trojans, or other badware.
* Avoid "doorway" pages created just for search engines, or other "cookie cutter" approaches such as affiliate programs with little or no original content.
* If your site participates in an affiliate program, make sure that your site adds value. Provide unique and relevant content that gives users a reason to visit your site first.