Mobile-first design means building websites and apps starting with phones in...

https://www.newpelican.com/articles/why-mobile-first-design-has-become-the-standard-for-modern-digital-services/

Mobile-first design means building websites and apps starting with phones in mind. It’s all about speedy loading, easy-to-tap buttons, and simple menus that make finding what you need quick and hassle-free