At this point you should be something of an Atom master user. You should be able to navigate and manipulate your text and files like a wizard. You should also be able to customize Atom backwards and forwards to make it look and act just how you want it to.
In the next chapter, we're going to kick it up a notch: we'll take a look at changing and adding new functionality to the core of Atom itself. We're going to start creating packages for Atom. If you can dream it, you can build it.