https://medium.com/@jannik.zuern/the-c-m-c-approach-towards-a-better-understanding-of-complicated-things-65b4a77d60ff

Lately, I came to the realization that the process of thoroughly understanding a scientific theory or fact may be divided into three tiers:

One cannot master a tier until the previous tier has been mastered thoroughly. Let me walk you through these three tiers: