In this section we'll learn about some core features you'll need to know in order to be a competent responsive designer. We'll cover technical things like what media queries are, and different approaches you'll need to be comfortable with, to make good decisions on what kind of responsive designer you want to be.
Media queries are the backbone of RWD. In this section we'll get familiar with what they are and what they can do. You'll use them often, but you won't have to memorize everything that they're capable of. It means that you should be familiar with what they can do in case the need ever arises.
Media queries are no joke. So far you've only learned about