Seo is one of the most if not the most important practices which help webmasters to rank their sites in the search engine rank placements. If done the correct and genuine way then it can boost your ranking upto the first page of the search engine, and if done the the illegitimate way and over optimize our seo then we stand a risk of being penalized By the the search engines.
Google Webmaster Tools
Bing Webmasters Tool
Google Adwords Tools
Sliders to websites in jQuery
A lista of free admin templates mobile / responsive design
Vertical accordion css3 and jQuery