This lists all your current tasks you have. It gives you information on each, including: the status of the task; the essences required; introduction to the task dialogue; and what you are actually required to make.
Here will be all of the objects you have built in your workshop, or collected from Sims' houses, that haven't been placed anywhere else.
This book will have records of all Sims you have interacted with, giving you a brief profile for them as well as telling you their interests. It will also tell you what your relationship status is, whether you are their Acquaintance, Friend or Best Friend.