Play by Play is an opportunity to watch experts work (not a step by step tutorial), but you'll learn about many topics. Ben starts by looking at the code and giving us a tour of his text editor (Vim), extensive shell customization, and tooling workflow. Ben then reads and understands the test code, then rewrites it to be clearer and more maintainable. He then sets his sights on the implementation code where he changes a bit of the API, then tackles a particularly terse method. The result is a dozen insights into when, where, and how to refactor code confidently. This isn't a rehearsed presentation, but a live discovery of code for the first time. If you're not confident with refactoring, you'll learn a ton from this video. If you are, you'll see how another expert does it.