Chapter 3. Mobile-first or Desktop-first?
In my years of experience designing and building responsive websites, I've found that in order to have a better view of the content and the messages, it's easier to visualize things with a desktop-first approach during the wireframe and design phases.
As we are able to see more content in a given layout with a desktop-first approach, it allows us to translate the hierarchy of the content that was provided to us into a layout that represents said hierarchy. Doing this in a small canvas of 320 pixel width is more difficult than it needs to be.
When you accomplish that hierarchy, it will remain the same on small-screen devices, and the only thing that changes is the layout.
Best practices recommend building ...