It's quite alright if you've missed the past 18 chapters of this story. They were boring anyway. Though William has enjoyed the boring moments, the sad, and the happy ones, he doesn't suspect you would care to hear the dreaded details of the past. Instead he would rather you understand how the story is progressing.
The 18th chapter was the chapter of love, loss and friendship. He learned quite a lot in this chapter. Though It did leave a few scars here and there but nothing to write home about. But more importantly, the 19th chapter has just begun. We shall see what kinds of relationships, situations, and opportunities await our young lad.