Use Google’s Mobile friendly testing tool to find out if each of your web pages pass the test.
Why is it important for my site to be mobile friendly?
Up to 60% of the people that come to your site are on a mobile device. This ensures that they can easily use your site. You’ll also convert (make more money) as more people buy from sites that are easy to use.
What does Google have to do with it?
Google gave us extra incentive by rewarding mobile friendly sites in the search results for mobile searches. Thus your site gets more traffic.