Google now uses a mobile index based on how devices crawl the web.
What is Google’s mobile indexing?

This method, which aims to provide the best experience for users who can search on all devices, means that Googlebot will only crawl and index the mobile version of a page.

This means that you may see a lot more traffic in your Googlebot log files. You may also see these snippets generated by the mobile version of your content in Google search results.

As alarming as it may seem, this is not the case at Google. Google has confirmed that it uses the desktop version of a site to rank mobile sites, but it also compares the two to check for any significant discrepancies (for example, users who create a spammy desktop website with the sole purpose of ranking high).

In recent years, it has become clear that desktop pages can be ranked by AMP (Accelerated Mobile Pages) in certain cases in the upcoming mobile-first index.

Google informs site owners

For the first time since the announcement of the start of the mobile-first indexing process, Google has notified SEOs and website owners via Google Search Console that their sites are transitioning to “mobile-first indexing.”

Google notifies website owners after the “mobile-first indexing” update

With mobile-first indexing, sites will have to pay more attention to mobile compatibility from now on. Because the majority of internet users access sites from their mobile devices and spend most of their time on mobile devices.