I don't understand how the verb gulp is used here. To gulp, as far as I know, basically means to consume or eat something very quickly, but that doesn't seem to fit the example in the book.
I guess that gulp is being used in a figurative sense, much like digest in digesting the news. Here, gulp would mean to learn about it quickly, possibly in an easy manner.
: to take in readily as if by swallowing <gulp down knowledge>
If learning about hardware has a reputation for being difficult or boring, then using that title might suggest that the material will be covered in a quick or easy manner. It could also suggest reluctance by doing it quickly, getting over it, as one might gulp some medicine.