Understand and optimize for. Want to write a lot of books? Get really good at writing long-form blog posts, which become chapters
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Replying to @mahemoff
My rule of thumb has always been that you should understand one level of abstraction below where you are working.
Work with HTTP? Know the fundamentals of TCP.
Write Ruby? Know a bit of C.
Work with EC2? Know how to boot a physical server.
Saves so many headaches.
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