134 - Simple vs. Simplistic - you want to aim for simple understanding, explanations, and solutions, while avoiding simplistic ones.
ThoughtCo offers a good explanation of the difference between the two. The importance of knowing the difference between the two was brought to my attention from reading Feynman’s books. Not sure which book he talks about it in, but here is a blog post that sums up his views.
This is what underlies the Feynman Learning Technique.