This is the article where Ethan Marcotte first set out the core ideas behind Responsive Web Design. It's worth a read to understand the origins of the design model that has come to power pretty much the entire Internet since 2010.

This single-page experience combines animations, video and sliders to explain the different types of responsive web and elearning design in a simple, clean infographic style.

This is a really great place to start if you're trying to understand how responsive design can help you tell stories, differently.

It has some awesome examples for inspiration plus a good overview of several responsive design options/effects/tools that you can use to help your content come alive and draw your learner in.