Because there are two kind of person which is they will learn through reading and understanding with the mistake of other people and came from shared experiences which they can now avoid the same mistake and knew what are the next move they will need to do, next on the other hand there are some people who learn from their experience they are firstly handed the mistakes and problem itself and they getting growth on this because they solve it by themselves only. Personally I'm into the second one because we knew that experience is the best teacher but of course with proper guidance through their lessons to get lessen the pain in money too of course.