What is the different of black hat seo & White hat seo ?
Black Hat is an SEO technique that goes against the rules and regulations of search engines. Examples are keyword stuffing, doorway/gateway pages, and link farming. White Hat is an SEO technique that adheres to the rules and regulations search engines. Examples are good quality content, correct keyword density, and quality inbound links.
This question has been asked and answered many, many times before. Please read the [SEO FAQ or use the [url=http://www.sitepoint.com/forums/search.php]Search](http://www.sitepoint.com/forums/showthread.php?182915-FAQ-Search-Engine-Optimization) facility to find past discussions.
If, after reading those, you've still got any specific questions that haven't been answered, please do come back and start a new thread. In the meantime, I'm closing this one.