Understanding is a relation between the knower and an object of understanding. Understanding implies abilities and dispositions with respect to an object. How to use understanding in a sentence.
Decision Making
Your understanding might be that your mother will always drive you to school if you miss the bus. Comprehension usually used with of. Both comprehension and understanding can be used to talk about someone's ability to understand something.
Or about how something works:
The meaning of understanding is a mental grasp : Understanding a concept means you get it. He noted bond's apparent lack of. Knowledge about a subject, situation, etc.