WordPress: All in One SEO Pack
Considered widely as an essential WordPress tool, the All in One SEO Pack created by Michael Torbert should be one of the foundation stones on which your search engine optimization activity is built on. By giving your web page an SEO-friendly title (that displays at the top of your Web browser), a homepage description (which shows up underneath the URL when people search via Google), and keywords related to your topic.
However, as a word or warning, be very careful with your keyword density. If Google suspects that you're stuffing keyboards into a web page or are using black-hat SEO techniques, then your search engine placement may be penalized by Google.