You learn by mistakes, mainly. You make a mistake and you kinda have fun doing it, but then you look back and say, hey, there must be a better way.
Madness string 102109
The risk isn't zero, and the benefits are usually subtle at best. On the other hand, mountain-climbing also has risks, and is so devoid of benefit that the only excuse mountaineers can come up with is 'because it's there'.