Google has been tight lipped about the ins and outs of their mobile-first index ranking but it is a necessary to be prepared as recent news from google shows that for the first time more people are viewing websites on mobile than desktop.
Mobile-first indexing gives priority to websites which have optimised mobile-friendly layouts and ranks/lists websites based on their mobile content.
Google’s interest in catering to what consumers are using reflects in this new indexing. In the past, Google’s search engine index has been based on crawls through desktop version of websites and now mobile versions are taking priority. Google have however mentioned that “if you only have a desktop site, we’ll continue to index your desktop site just fine, even if we’re using a mobile user agent to view your site“.
It is important to have a mobile-friendly version of your website if you want to cover the widest audience, and Google will be giving priority to websites which have a mobile version with relevant high quality content. Google have said that if you have less content on your mobile version of a page than a desktop verison, it will look at the mobile version so they recommend you update on a page-by-page basis so all your content spans both.
For more information, head on over to searchengineland where they’ve defined a list of everything Google have said in the past on this indexing.