tldraw (1 blogmarks)
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https://github.com/johnxie/awesome-code-docsMost documentation tells you what to do. These tutorials explain how and why complex systems work under the hood — with architecture diagrams, real code walkthroughs, and production-grade patterns.
Tom MacWright drew my attention to this repo specifically the tldraw portion that explains how they use state machines to represent what every tool can do on the canvas.