Prepare Your Website for the “Mobile Friendly” Algorithm
Google officially recommends responsive design for your website, more information is here. Be sure that your pages are available from the same URL to all devices.
Test your website for mobile-friendliness using Google’s free tool. You want the green with “Awesome! This page is mobile-friendly” message.
If you don’t have the green bar from Google, you have to change your website soon.
Track positions for mobile rankings. Now you can choose from multiple tools that you can use and track your positions and competitors mobile rankings.
Avoid “Mobile Friendly” Mistakes
404 Mobile Error: Don’t redirect the desktop version of the page to 404 error if it not available for mobile.
Media content: Keep media to be played on every device, which includes video and audio files that are not unplayable on smartphones, for example if they require Flash.
Mobile page speed: Page load is an important user experience factor and you have to optimize the loading process. You can use the Google’s Page Speedtest tool.
Avoid duplicate content: Don’t duplicate content on desktop and mobile versions. (That’s why Google recommends a responsive design solution.) Don’t use different URLs and redirects between the desktop and mobile versions.
Don’t implement the mobile site on a different domain, subdomain, or subdirectory from the desktop site.