It lets you capture all your notes, to-do lists, calendars and sketches and organize them into a single system.
It uses a practice called “Rapid Logging,” which involves quickly jotting down tasks, thoughts and ideas as they come to you, categorizing those items with bullets, and creating an Index to make each item easy to find.
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You can start a bullet journal in pretty much any empty notebook that you have lying around. That’s all you need. A journal and a pen.
However, it is much more likely to use a bullet journal every day when getting some joy from the materials you're using. That means that a nicer journal and some bright, funky pens are also a great way to get started and enjoy the process a bit more.