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

https://technivorz.com/why-do-mobile-users-miss-buttons-even-when-they-are-on-the-screen/

Mobile-first design means creating apps and websites that work great on your phone before anything else. It makes things load faster, so you spend less time waiting. Buttons and menus are easy to tap with your fingers, not just a mouse