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

https://www.red-bookmarks.win/mobile-first-design-means-building-apps-or-sites-to-work-great-on-phones-before

Mobile-first design means building apps and websites starting with phones in mind. It makes everything load fast, so you don’t wait around. Buttons and menus are big and easy to tap, perfect for thumbs on the go