This month Google begins rolling out mobile-first indexing to more sites
Sites that follow the best practices for mobile-first indexing will be migrating over now, and Google will send notifications via Search Console.
What is mobile-first indexing?
Google says it is about how Google crawls your site. Google will only have one index, but how Google crawls and creates the index will be based on a mobile-first experience going forward.
Find out more: https://searchengineland.com/google-begins-rolling-out-mobile-first-indexing-to-more-sites-295095
