That would mean you went deeper in this chapter than in the previous one. The first fast iteration is really to get familiar with the main ideas and terminology

That would mean you went deeper in this chapter than in the previous one. The first fast iteration is really to get familiar with the main ideas and terminology. For example if it's a book on algorithms, you skim through it and understand what is linkedlist, what is tree, what is graph, their running time but not the details of implementation and certainly not exercises. Then on the next one you try to understand basic implementation, but still not doing any exercises. Then on the next one you try to implement them and do some exercises. That's fun, keep you moving, refreshing your memory and it doesn't feel like you've been reading this book forever and still on the 3 chapter.