Ninja

This is what you reach for when Ninja build output is cryptic or you need to understand what CMake is doing under the hood. It covers the practical stuff: getting verbose output with `-v`, controlling parallel jobs, generating compile_commands.json for tooling, and reading those auto-generated build.ninja files when something breaks. The cheatsheet format for flags and common errors is handy. Most developers only interact with Ninja through CMake, so the skill wisely focuses on that workflow first, then digs into the lower-level tools and debugging commands for when builds fail in non-obvious ways.