I certainly learned this the hard way. When I started writing code 40 years ago, I used to over estimate my understanding and abstraction skills a lot. As a re

I certainly learned this the hard way. When I started writing code 40 years ago, I used to over estimate my understanding and abstraction skills a lot. As a result I created overly complicated and difficult to maintain/evolve solutions. Turns out I need to see more examples of patterns before making good choices, which means becoming comfortable with seeing and tracking duplication over time.