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Index

Hard ideas, drawn
so you understand them.

534 sketch-style boards and 583 written lessons across 18 tracks, set in reading order across 100 modules. No background needed. Every track starts from the basics.

Start with lesson one or pick a track

watch one of 219 videos →the first three lessons of every track are free; plans unlock the rest →

The Chai Stall That Got Famous
The Chai Stall That Got Famous · System Design
100 modulesThe courseEvery board and lesson, in reading order.89 labsLabsInteractive simulations you can adjust and run.42 papersPapersFoundational papers: what they claim, the key idea, and what aged badly.219 videosVideosNarrated explainers in the same chalkboard style.534 boardsDailyOne board a day from the full collection.902 termsGlossaryEvery term, defined by the board that introduced it.

Contents

I want to understand

  1. how an LLM worksAI
  2. how a packet crosses the internetNetworking
  3. what a database does with a writeDatabase Internals
  4. how one server becomes a thousandSystem Design
  5. what a CPU actually doesHow Computers Work
  6. how to think about an algorithmDSA

Tracks

  1. From Scratch92 lessons
  2. DSA70 lessons
  3. Mind Blown64 lessons
  4. AI54 lessons
  5. DevOps50 lessons
  6. System Design46 lessons
  7. Finance37 lessons
  8. Networking24 lessons
  9. Database Internals20 lessons
  10. Security19 lessons
  11. How Computers Work18 lessons
  12. Data Systems15 lessons
  13. Game Theory15 lessons
  14. Psychology15 lessons
  15. Philosophy14 lessons
  16. Personal Development12 lessons
  17. How Things Work12 lessons
  18. Portfolio Projects6 lessons

Case studies

  1. Amazon9 boards
  2. Claude9 boards
  3. Cloudflare9 boards
  4. Discord9 boards
  5. Dropbox9 boards
  6. Figma9 boards
  7. Git Diff9 boards
  8. Google Maps9 boards
  9. all 19 companies→