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Here are some of the guidelines for webmasters from Google
Following these guidelines will help Google find, index, and rank your site. Even if you choose not to implement any of these suggestions, we strongly encourage you to pay very close attention to the "Quality Guidelines," which outline some of the illicit practices that may lead to a site being removed entirely from the Google index or otherwise penalized. If a site has been penalized, it may no longer show up in results on Google.com or on any of Google's partner sites.
Design and content guidelines
Make a site with a clear hierarchy and text links. Every page should be reachable from at least one static text link.
Offer a site map to your users with links that point to the important parts of your site. If the site map is larger than 100 or so links, you may want to break the site map into separate pages.
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. The Google crawler doesn't recognize text contained in images.
Make sure that your TITLE tags and ALT attributes are descriptive and accurate.
Check for broken links and correct HTML.
If you decide to use dynamic pages (i.e., the URL contains a "?" character), be aware that not every search engine spider crawls dynamic pages as well as static pages. It helps to keep the parameters short and the number of them few.
Keep the links on a given page to a reasonable number (fewer than 100).
Quality guidelines
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 (e.g. 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.
Quality guidelines - basic principles
Make pages 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
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