Crisp boundaries - Code with Jason

If you’re going to make a change to an area, you have to understand that area. If you don’t understand the area you’re changing very well, your lack of understanding might lead to you accidentally introducing a bug.Well-written code is loosely coupled from the other pieces of code it touches. “Loosely coupled” means that if you have classes A and B which talk to each other, you can understand class A without having to know much about class B and vice versa.