Responsive web design is a great solution to our multi-screen problem, but getting into it from the print perspective is difficult. No fixed page size, no millimetres or inches, no physical constraints to fight against. Designing in pixels for Desktop and Mobile only is also the past, as more and more gadgets can open up a website. Therefore, let's clarify some basic principles of responsive web design here to embrace the fluid web, instead of fighting it. To keep it simple we'll focus on layouts (yes, responsive goes way deeper than that and if you want to learn more this is a good start).
Responsive vs Adaptive web design
It might seem the same but it isn't. Both approaches complement each other, so there is no right or wrong way to do it. Let the content decide.