I listen to mostly non fiction audio books during my commute. If I find a key point that I want to save, I write it down when I arrive. If I find there is a g

I listen to mostly non fiction audio books during my commute. If I find a key point that I want to save, I write it down when I arrive. If I find there is a good amount of knowledge that I simply cannot recall, I look for a short summary of the book in paper form. If there is no summary, I will look for a good used copy in paper form.