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

https://reidwxzz567.image-perth.org/what-can-i-learn-from-mobile-casino-design-about-usability

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