I love a good re-design story and this recent one about how Shopify shifted to a more mobile-friendly version of their site is a must-read.
Here’s a snippet covering how they strategically used breakpoints to deliver key content to different screen sizes:
Ultimately, this shows that Shopify determined a strategy for content resolution: what content should be available at all breakpoints, on all devices, versus what content should only be available if the on-screen real estate is that of a desktop or tablet? These kinds of questions lead to a better overall content strategy, and should arguably be a part of all responsive design efforts.
How They Did It: Shopify via TutsPlus