0.6 How to not get stuck
| Situation | Do this |
|---|---|
| "I don't understand this paragraph" | Read the next two. Usually resolved. |
| "Still lost after 20 minutes" | Write the question in notes.md, mark TODO, move on. Return in 2 chapters. |
| "The command doesn't work" | Read the last line of the error. Check if it needs sudo. Check your OS (macOS vs Linux differ). |
| "I understand but can't explain it" | You don't understand it yet. Re-read only the "How it works" section, then try again. |
| "There are too many acronyms" | Appendix A is a plain-language glossary. Bookmark it now. |
| "This feels too basic" | Skip to Practice. If you can do it, move on. |
| "Should I memorise port numbers?" | No. Appendix D exists. You'll absorb the common ones naturally. |
| "Do I need to learn the OSI 7-layer model?" | For exams, yes. For understanding, the 4-layer model in Chapter 3 is better. We cover both. |
A note on honesty
This guide marks where it is simplifying:
Simplified: the real story has more detail; here's the direction it goes.
Debated: engineers genuinely disagree; here are the sides.
Facts, numbers, and RFC references were checked against primary sources — see Appendix E.