On the Google webmaster blog, there is a new post that gives us more advice about getting ready for the mobile-first index.

It was confirmed by Google that it rolled out the mobile-first index “for a handful of sites.”  The company said that the search team is “closely” monitoring those sites for testing purposes.

When your site has been moved over, you’ll know because you’ll see a significantly increased crawling rate by the Smartphone Googlebot in your log files and the snippets in the results, as well as the content on the GOogle cache pages, will be from the mobile version of your web pages.  For the time being, Google says that only a small number of sites have migrated.

Here are some tips from Google’s Gary Illyes that will help you get ready for the mobile-first index:

  • Make sure the mobile version of the site also has the important, high-quality content. This includes text, images (with alt-attributes), and videos — in the usual crawlable and indexable formats.

  • Structured data is important for indexing and search features that users love: It should be both on the mobile and desktop version of the site. Ensure URLs within the structured data are updated to the mobile version on the mobile pages.

  • Metadata should be present on both versions of the site. It provides hints about the content on a page for indexing and serving. For example, make sure that titles and meta descriptions are equivalent across both versions of all pages on the site.

  • No changes are necessary for interlinking with separate mobile URLs (m.-dot sites). For sites using separate mobile URLs, keep the existing link rel=canonical and link rel=alternate elements between these versions.

  • Check hreflang links on separate mobile URLs. When using link rel=hreflang elements for internationalization, link between mobile and desktop URLs separately. Your mobile URLs’ hreflang should point to the other language/region versions on other mobile URLs, and similarly link desktop with other desktop URLs using hreflang link elements there.

  • Ensure the servers hosting the site have enough capacity to handle potentially increased crawl rate. This doesn’t affect sites that use responsive web design and dynamic serving, only sites where the mobile version is on a separate host, such as m.example.com.

For more information, check out the mobile-first index FAQs.