This video provides an excellent foundation for responsive design.

I've been following Stef ever since I got interested in learning Python. I started out with some basic code training to get the grip of it and then took up the Killer Python training based on a recommendation I got from Stef himself in the comment section of one of his vlogs on youtube! One thing you can see from the very beginning is the fact that it's very "real-world" orientated. And this is exactly what I was looking for because I got the feeling that all of the sites I was spending time on were fun, but not very practical.

The course is very well structured and the explanations are very clear and crisp. I'm 100% satisfied with my purchase and I'm looking forward to acquiring more knowledge from Stef. I would highly recommend you give this a go if you are at the beginning of the Python learning journey. It's a killer course indeed! Thank you Stef!

"I just wanted to drop you a line to thank you. I knew nothing at all before I came upon your site
but know Im doing OK not an expert by any means but your site got me up and going enough to understand what I was doing
instead of just shooting in the dark. Again thank you so much for your great site."