Relax, just sit back, turn up the volume (not too loud) and sing along:

https://youtu.be/4r2yVNeAFPc

And be sure to take the very valuable advice at heart, after the song...

Oorspronkelijk geplaatst op Quora: What are typical screen-width breakpoints that should be considered for CSS media queries when designing a responsive website, since devices come in all shapes and sizes?"