Mobile-first, Adaptive, and Responsive Web Design are hot subjects sprinkled with tricky subtleties that can be difficult to fully understand without visualizing them. I believe this course is one of many great resources to untangle those subtleties and fully understand them.<p>I joined the Code School team earlier this year and it was my dream to see the work of Ethan Marcotte, Luke Wroblewski, and Aaron Gustafson turned into one of our interactive courses.<p>While I haven't participated that much in this course's conception, I'm proud of the great work our team has done over the past few weeks to get this done and I think more product and company builders should take a step back to understand the potency of the "context" principle.<p>It's something that goes far beyond the aesthetic layer of a website, product or service. It defines what this product should be, and how it should be.