Put another way, it's easier to write a throwaway program that works once but how do you make it continue to work and serve needs over some period of time? I th

Put another way, it's easier to write a throwaway program that works once but how do you make it continue to work and serve needs over some period of time? I think part of it is knowledge of principles like you said, but I also don't think there's a substitute for experience because the real world is messy and principles sometimes need to be intentionally broken.