Mobile-First indexing means that Google will look at the mobile version of your website as a priority over your desktop version of your website to decide where to rank your pages.  Some key points to making sure your WordPress website is Mobile Friendly You can check if your site is mobile friendly here: https://search.google.com/test/mobile-friendly Use image compression Use a caching plugin.  Get rid of intrusive pop-ups, ie pop-ups that are larger than a small screen.