Are you prepared for Mobile-First Indexing?
Mobile First indexing means that in future Google will use mobile version content for indexing and ranking and those who don’t have those will lose rank and indexing which they have made till date.
Earlier Google used Desktop URL’s for Indexing when evaluating the relevance of a page to a user's query. This process came in action because of the majority of users are accessing Google through a mobile device, therefore index will primarily use the mobile version of a page's content.
In general Google Bot crawls and Indexes pages with the smartphone agent, therefore they will be able to continue to show the URL which is more appropriate for the users.
Google go through all the website slowly and eventually to ensure good experience for site owners and users we evaluate each site individually on its readiness for mobile-first indexing.
If you have this type of site...
Best practices for dynamic serving and separate URLs
If your site have separate content for mobile and desktop it means you have separate url but the content should be the same.
Your mobile site should contain the same content as your desktop site
Data on your site should be structured on both versions.
Meta Data should be there on both the version.
Additional best practices for separate URLs
Both the version mobile and desktop should be verified under google search console.
Hreflang (specifies the language and optional geographic restrictions for a document).
Ensure your servers have enough capacity.
Robots.txt should be verified.
Make sure you have the correct rel=canonical and rel=alternate link elements between your mobile and desktop versions.