On-site SEO is great because it’s things entirely in your control that can affect how your site ranks in search. You can’t control the search engines; you can’t control your competitors; you can’t control external links. You can control your own website and content.
As more than half of Google users are mobile searchers, it makes sense that Google wants its index and results to represent the majority of its users. In the past Google has crawled the web from a desktop browser point of view, however soon it will do it from a mobile browser viewpoint. Find out what this means for your business.