0.2 The learning flow (use this for every chapter)

Reading about networking does not teach you networking. Running commands and watching real packets does. Every chapter is built to support this loop.

   +------------------------------------------------------------------+
   |                                                                  |
   |   1. READ        2. EXPLAIN      3. PRACTICE     4. CHECK        |
   |   (10-20 min)    (5 min)         (15-45 min)     (5 min)         |
   |                                                                  |
   |   Read the  -->  Close the  -->  RUN the     --> Answer the      |
   |   chapter        guide and       commands on     "Check          |
   |   once,          say it in       YOUR OWN        yourself"       |
   |   slowly.        your own        machine.        questions from  |
   |                  words.          Change things.  memory.         |
   |                       |                              |           |
   |                       | can't explain it?            | got one   |
   |                       +---> re-read that section      | wrong?    |
   |                                                       |           |
   |                       +-------------------------------+           |
   |                       v                                           |
   |   5. CONNECT: write ONE line in your notes:                       |
   |      "X exists because Y was a problem, and it works by Z."       |
   |                                                                  |
   +------------------------------------------------------------------+
                                   |
                                   v
                 every ~5 chapters: CAPTURE something real
                 (open tcpdump/Wireshark and watch it happen)

Why each step matters

Read once, slowly. Don't re-read a paragraph three times. Push on — the next paragraph usually answers your question.
Explain out loud. The highest-value step. If you can't explain it simply, you don't understand it yet, and you find that out in 5 minutes rather than 5 weeks.
Practice on your own machine. Networking is the most observable subject in computing — you can literally watch every byte. A concept you have seen in a packet capture is a concept you own forever.
Check yourself from memory. Don't look back first.
Connect. One line per chapter in your own notes.md. After 40 chapters you have a map of networking that you wrote.

The rules that keep you moving

Time-box confusion to 20 minutes. Write the exact question down, mark it TODO, move on. It will usually make sense two chapters later.
Never skip the Practice sections. Reading Part 5 without watching a real TCP handshake in tcpdump is how people "learn TCP" three times and still can't explain it.
Don't chase every link. Further Reading is for later or when stuck.
One pass, then depth. Get through the whole guide shallowly before going deep on any part.
Keep a notes.md with: your one-line summaries, your TODO questions, and every command that surprised you.