Mobile-first design means creating apps and websites that work best on your...

https://fast-wiki.win/index.php/Mobile-First_Design_for_Tablets:_Do_I_Design_Differently%3F

Mobile-first design means creating apps and websites that work best on your phone. It’s all about speed—pages load fast so you don’t wait. Buttons and menus are easy to tap with your fingers, and the layout is simple to navigate