Mobile-first design means building apps and websites that work perfectly on...

https://wiki-spirit.win/index.php/What_Should_I_Fix_When_Users_Complain_%22The_Site_Is_Hard_to_Use_on_My_Phone%22%3F

Mobile-first design means building apps and websites that work perfectly on your phone before anything else. It’s all about speed, making sure pages load fast so you’re never waiting