Use the Google Webmaster Guidelines for Better Search Engine Ranking
To ensure that your Web site achieves the highest possible ranking on the Google index, you can use their own guidelines to ensure that your site meets their standards.
The following information was taken from the Google Webmaster Guidelines. Be aware that Google does occasionally update their guidelines, and so you should monitor the Web site (or search for Google Webmaster Guidelines in Google) so that you're always playing within the rules.
These quality guidelines cover the most common forms of deceptive or manipulative behavior, but Google may respond negatively to other misleading practices not listed here (for example, tricking users by registering misspellings of well-known websites). It's not safe to assume that just because a specific deceptive technique isn't included on this page, Google approves of it. Webmasters who spend their energies upholding the spirit of the basic principles will provide a much better user experience and subsequently enjoy better ranking than those who spend their time looking for loopholes they can exploit.
If you believe that another site is abusing Google's quality guidelines, please report that site at https://www.google.com/webmasters/tools/spamreport. Google prefers developing scalable and automated solutions to problems, so we attempt to minimize hand-to-hand spam fighting. The spam reports we receive are used to create scalable algorithms that recognize and block future spam attempts.
Quality guidelines — basic principles
Make pages primarily for users, not for search engines. Don't deceive your users or present different content to search engines than you display to users, which is commonly referred to as "cloaking."
Avoid tricks intended to improve search engine rankings. A good rule of thumb is whether you'd feel comfortable explaining what you've done to a website that competes with you. Another useful test is to ask, "Does this help my users? Would I do this if search engines didn't exist?"
Don't participate in link schemes designed to increase your site's ranking or PageRank. In particular, avoid links to web spammers or "bad neighborhoods" 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.
Quality guidelines — specific guidelines
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 behavior, 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.
If you determine that your site doesn't meet these guidelines, you can modify your site so that it does and then submit your site for reconsideration.