Can any one tell me what is keyword density? and what is the exact percentage of this density to maintain?
It's the amount of times your targeted keywords are mention on your webpage Just make your page copy sound natural to a human audience and you will be just fine
3-5% and no more otherwise Google will think you are keyword stuffing, but the person who said to write naturally is correct, Google is ont ehlookout for pages that read like they are not naturally written