Every chapter, apart from the first one, includes a section called Digging Deeper. This is where you will explore specific aspects of Ruby (including a few of those gnarly byways I mentioned a moment ago) in greater depth. In many cases, you could skip the “Digging Deeper” sections and still learn all the Ruby you will ever need. On the other hand, it is in these sections that you will often get closest to the inner workings of Ruby, so if you skip them, you are going to miss out on some pretty interesting stuff.