Google SEO Website Tips

• Create a useful, information-rich site, and write pages that clearly and accurately describe your content.
  
• Think about the words users would type to find your pages, and make sure that your site actually includes those words within it.
  
• Try to use text instead of images to display important names, content, or links.
• Don't participate in link schemes designed to increase your site's ranking or PageRank. In particular, avoid links to web spammers or "bad neighbourhoods" on the web, as your own ranking may be affected adversely by those links.
  
• Don't use unauthorized computer programs to submit pages, check rankings, etc. Such programs consume computing resources and violate our Terms of Service. Google does not recommend the use of products such as WebPosition Gold™ that send automatic or programmatic queries to Google.
  
• Avoid hidden text or hidden links.
  
• Don't use cloaking or sneaky redirects.
  
• Don't send automated queries to Google.
  
• Don't load pages with irrelevant keywords.
  
• Don't create multiple pages, subdomains, or domains with substantially duplicate content.
  
• Don't create pages with malicious behaviour, such as phishing or installing 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.
  

Source: Google