Keyword density is a key part of SEO. On each page write approximately 200 to 500 words. Write it with your targeted keyword phrases. Remember not to over due it and get banned from search engines for spam or make your visitors hate you. Put your keywords in bold and in heading tag. Try to get a density of 5 to 15%. If your not sure what you keyword density is try using http://superiorwebmaster.com/webmaster-tools/page_primer.php.

Search engines will not only use links to find new sites, but they'll count each link to a site and use this to determine how popular that site is. What you want to get is quality links. These links should come from web sites that are related to your topic. Don't exchange links with every site you can. Take time to check each one before exchanging links. Make sure they are a clean and professional site. Look to see if they use spam.

Other thing to consider is to make sure HTML is valid. Spiders are somewhat like browser you use, they read HTML to display web page. If your HTML code contains errors, spiders might not be able to find content on page. Although most spiders will try to correct minor errors in HTML code, it could still hurt your ranking. Visit w3.org to have your HTML code validated.

Break Into Your Topical Neighborhood

To make your Web site an authority, you should first seek to obtain links from topical hubs. Obvious hubs might include any niche directories or resource pages about your Web site's topic.

One way to find less obvious hubs is to do a backlink search on authority sites in your topical community. Finding authority sites is easy--they are sites that rank highly for a search for that topic. Once you find an authority, search "link:http://www.theirsite.com." Go through backlinks, and find pages that link out to multiple sites within your topic; a page that links out to multiple authority sites is probably considered a hub by a search engine.

Aside from hubs, it can be quite helpful to get links from authority sites themselves. I have seen many Web sites get a significant boost after obtaining just one link from a top authority. It is implied that an authority site will link out less than will a hub, and therefore it is possible that these links are even more valuable in terms of rankings.

Obtaining links from quality hubs and authorities is easier said than done. One can however use certain methods to get links quickly. These methods include but are not limited to: offering to swap links; submitting a relevant, well-written press release; submitting a relevant, well-written article with your Web site's URL hyperlinked and embedded in copy; offering to buy or rent a links; and, of course, writing a lot of great content (it will get noticed, sooner or later!). Conclusion

Obtaining links from reputable sources within your Web site's topical community is necessary in order for that site to be ranked highly in today's search engine algorithms. Getting your Web site entrenched within its topical community would be a good idea anyway, even if search engines did not exist--which is a pretty good litmus test for a strong, long-term SEO method.