From the introduction:
Bullet journaling has become something of a phenomena over the past few years. The ability to combine the calendar functions of a day planner, the utility of to-do lists, and the personal documentation of a diary into a single, easy-to-use notebook is appealing and practical. It’s a simple, efficient, and flexible means of organizing a lot of information. I’ve used one for a few years now both personally and professionally. I have created special bullet journals specifically from managing major projects, planning a novel, and yes, running a tabletop roleplaying campaign.