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

https://emilioezho292.theglensecret.com/is-it-better-to-cut-features-on-mobile-or-keep-the-same-experience

Mobile-first design means creating apps and websites that work great on phones first. It’s faster to load, with big buttons and easy-to-tap features that fit your screen. The menus are simple, so you can find what you need without fuss