Mobile-First is Content First
Content becomes the priority in mobile-first web design. This design creates a hierarchy of content users need, use, and appreciate. Designing with restrictions and limitations forces the user experience designer to remove unnecessary elements and focus on the essential.
The mobile user visiting your website sometimes has different needs than your typical desktop user. Sometimes, but not always, a desktop user may be looking for more in-depth information or additional features that are more difficult to render on mobile.