It's a single basic thing users absolutely must learn. It's a foundation designers use to build their solutions upon. Every tool requires some prior knowledge t

It's a single basic thing users absolutely must learn. It's a foundation designers use to build their solutions upon. Every tool requires some prior knowledge to use it. You cannot use a spoon until you learned how to use it. Hierarchical structures are natural to humans. Books with volumes and chapters, organizational structures, administrative hierarchies, etc, etc. I defy the idea of people who "don't get" directory structure. It.. just cannot be real.