0.4 How not to get stuck

• If a chapter references something from an earlier one ("covered in Chapter 3"), that's intentional — later chapters build on earlier mechanisms rather than re-explaining them. Go back if it's not fresh.
• Reproduce examples yourself. dig www.netflix.com, curl -v https://example.com, and your browser's Network tab (DevTools) turn every diagram in this guide into something you can watch happen in real time.
• The "5-year-old" version is not a joke or filler — if the deep section of a chapter loses you, go back to the analogy, then re-enter the deep section. It's there because the mechanism really is that simple at its core; the complexity is all in the edge cases.