How to learn and teach a subject (my own understanding, not 100% what the article says):

  1. Create a notebook and write down what you know.
  2. Create another notebook and write the same things down in a way that you can read it to a child and they can understand. Do this by actually reading it out loud. Take note of where you stumble.
  3. Open the first notebook again. Write down whatever you find you do not know or understand.
  4. Iterate.