Insightful videos/books

What books or videos have you watched which were aha moments or step changes in your thinking? I’m specifically interested in software/management topic, but would love recommendations from across the spectrum.

For me, in the last year, one of my key aha moments came from this video:

And then the book by the author https://amzn.to/3kJxEcf - I found the video long after the original talk was given, but its still excellent.

Team topologies focuses on the idea of Conways law (“Organizations will build systems which are copies of the communications structure of the organization”) and trying to build software that fits in your head (optimize for cognitive load). It gives practical and actionable advice and after applying it, I’ve seen big improvements.

What was your aha of the last 12 months?