Believe me or don't, but I dreamt about this, and then someone told me this exists
The basic idea is to prepare questions instead of answers, and then give answers in a way how you would teach the content to someone else.
I felt the need to do so after business-meetings, where I needed to report what happened to my manager. Sure, I always take notes, but taking notes does not foster understanding. Instead, I write down questions I have and then try to answer them -- often I get stuck, or discover a new perspective.
Example: We are going to do XYZ because... vs. Why are we going to do XYZ? What are the alternatives? Is XYZ truly the best approach? What has been tried before?
Knowledge needs active recall, and only when I can explain the cause and reason to someone else can I claim that I truly understood.