All productivity systems agree that your brain is for thinking, not storing your to-do list.

The first rule of productivity is to write down everything you need to do in a single place. This way you’ll never forget something, and you’ll be far less stressed.

Experiment and find what works best for you. You can use a paper notebook, a simple text document, or one of the dozens of to-do list apps. Pick one you like and stick to it.