About 15 years ago I read Getting Things Done by David Allen. One of the most important things I learned was to not keep important information in my head, especially things like tasks and commitments I need to complete.
Your brain is not a reliable storage device and cannot multitask. If you are relying on your grey matter to remind you of all the things you need to do, you are probably falling down on half of them.
Keep a to-do list in some form or another. This one lesson learned in 2006ish has changed the course of my life and allowed for some semblance of success.
