Okay, let's just focus on the fact that this isn't the full Core Rulebook and it doesn't have all the ins & outs and intricacies of the full system. It's not meant to have them...it's meant to be a game that gets you going. You learn enough to play a pre-generated adventure with pre-generated characters...but that's the point: you're learning to play the game. The rules tell you what you need to know when you need to know it.