SEO Onpage optimization

Search engine optimization
SEO is considered to be most powerful tool in the web development . From a search engine perspective, Search Engine Optimization is the process of making web pages easy to find, easy to crawl and easy to categorize.
Keyword Selection
The best keywords will be those that are popular search terms (terms that people actually search for), and that clearly describe the purpose and the content of your pages. They will also have to be keywords for which there is relatively low competition. Finalizing the wrong keywords can throw off your entire search engine optimization strategy.
Keyphrases in the body of your page:
It is important to use your keyphrases on your page, since this will help the search engines determine what your page is about, and its relevance to your chosen keywords:
Use your keyphrases several times, and place them as close to the top of the page as possible.
Place your keyphrases between Header Tags (H1, H2 or H3) in the first two paragraphs of your page. o Place your keyphrases in bold type phase at least once.
Repeat your keyphrases often to increase your keyphrase density. Repeating your keyphrases between 5 to 10 times for every 100 words in your page is considered effective. You must also take into account your visitors: they should be able to read your page fluently and effortlessly and the text must not sound awkward. (Remember that ultimately it is your readers who will decide if your page is worth the time they spend on it).
If you use a left navigation bar, the search engine will read it before the body of your page. Make sure you include your most important keywords there, too
Posting in forums and weblogs
Since forums and weblogs offer plenty of fresh content, search engine spiders tend to crawl them often. If you are a prolific contributor to these types of site and use a signature file with a link to your page, having many entries may give you a relevance boost with the search engines. This technique, however, has been abused so much that as of January 2005 Google and other search engines have decided to support a 'no-follow' filter, an attribute that can be set up by blog and forum owners so that guest comment links and signature links will not be followed by search engines.

Search engines are becoming more sophisticated in detecting unnatural linking patterns. For example, if all you inbound links come from the same site, or if they all have the same link anchor text, it will look abnormal and search engines may devalue your link profile .Also, try to get more one-way links (like directory links or resource box links) than reciprocal links. The more you can make your link profile look natural, the better your pages will rank.
Generating Good Keywords
When you have a good list of keywords, you can use several on-line tools to search for related possibilities:
1.google ad words tool
2. Word tracker
Anchor text
Anchor text refers to the words that make up a link; they are the words that turn your mouse cursor into a finger-pointing hand. For example, in the sentence, "I really like to go to “ web design chennai ," "web design chennai" is anchor text for the link.
The important of Anchor Text
Search engines gather data by traveling around the web via links, jumping from page to page. Links are the lifeblood of a search engine and are used as key indicators for identifying the topics of the pages they're about to go to. If 100 sites link to a site with the link "web design chennai" or seo services Chennai, the search engine can be fairly confident that the site is about an web design t in Texas. If you want a page to rank for a keyword that is particularly difficult, be sure to focus on getting the keyword in your anchor text.
Internal Linking
Internal linking is the process that is taken to link one page with another within the same website
Website gets properly spidered and crawled
Build the relevancy of a page to a keyword phrase
Increase PageRank to inner pages of your site/blog