a personal notebook

Successful people track their progress, set goals, reflect, and learn from their mistakes. And they often use some kind notebook to accomplish this. If you want to get somewhere in life, you need a map, and this notebook is that map. You can write down what you did today, what you tried to accomplish, where you made mistakes, and so forth. It’s a place to reflect. It’s a place to capture important thoughts. It’s a place to be able to track where you’ve been and where you intend to go. It’s one of the most underused, yet incredibly effective tools available to the masses.

Angel Chernoff