Check out this must-read post that covers many real-life examples and techniques for designing responsively, all supported by helpful illustrated examples.
“I was preparing a concept design for Sketch app to demonstrate my feature ideas. I used the beta version of Sketch (3.9) for that to try the new features and also to test my plugins to see if they are working still.
After a while, I realized that the new feature called “group resizing” is really simple but yet powerful if you use it right. It’s a feature for building responsive designs. I should say that the simplicity behind it is really genius!…”