This video provides an excellent foundation for responsive design.

"Your website is so good. Your explanations in ordinary language are very, very helpful to a neophyte
such as myself. The real exercises, e.g. creating a page from html is fun and alleviates the apprehension that Ive had
about venturing into what has seemed to be a mysterious and complicated process."

I really enjoyed the course, it was very well designed and presented which made it is pleasure to watch. I learned a lot more about real world OOP programming.