Keywords research must be done before actually writing texts.
Three levels of keywords would help you to get the right traffic for your site. And these levels mirror you site structure: Home Page, Category Page(s), Content Page(s).
This simple rule Mike Mindel has just explained on ELance.com blog.
Sample ‘tea’ structure provided by Mike Mindel speaks for itself.
Mike Mindel founder of Wordtracker.com, the keyword research company.
Read more: Use the Pyramid Approach to Build Web Traffic