Responsive websites are the future! They allow your site to adapt to different screen sizes which means that whatever device your web visitors are using they get the best possible view of your business or service.
The idea behind retina ready is to create something that would look as sharp as it would in print. Colors are vivid and bright because you get more pixels per inch on retina ready devices. It’s essentially like high definition for your laptop, phone or tablet.
Google and all search engines show and rank websites in search results on the basis of various predefined parameters. The more parameters you fulfill, the better your website ranks in search results. Good news is that WordPress takes all the SEO responsibilities that a CMS is supposed to fulfill.