Having a mobile site goes beyond the way the site works.
Google may report that your site is mobile friendly. That means the content is visible on various size screens without forcing the user to scroll left and right and that “tap” sizes are larger enough for users to “click” with their fingers.
But a mobile-first approach to content and digital publishing requires your site go beyond responsive design and address the way people consume content. Mobile users read content while on the run or participating in other activities and tasks, scanning content instead of reading. As such, your content should include headers, bullet points and short paragraphs to allow users to easily glance at content without missing out on valuable information.
Learn more about mobile friendly content in this article from Forbes.