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The starter track is free — read all lessons and practice for free. Full access to every track (current and future) is $14.99/month. Cancel anytime.

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Each track is designed as a 30-day challenge — one lesson per day, about 15 minutes each. Go at your own pace, but the structure is built around daily consistency.

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Each lesson is a student-teacher dialogue with code examples, followed by a hands-on code challenge in an in-browser editor. You read, you understand, then you write real code.

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Our beginner track starts from absolute zero — no prior experience needed. Advanced tracks build on earlier ones, and the platform tells you exactly where to start.

How is zuzu.codes different from freeCodeCamp or Codecademy?

zuzu.codes uses a structured 30-day track format with dialogue-based teaching, an in-browser code editor, and gamification (XP, streaks, progress tracking). The format builds genuine understanding through daily practice.

Day 8 · ~11 min●

Six lessons on event-driven workflows: push vs pull tradeoffs, JSON payload parsing, HMAC-SHA256 signature verification with constant-time compare, event dispatch via dict-of-handlers, replay idempotency on event IDs, and event-triggered Sheet writes.

Week 2 moves to direct HTTP, rate-limit awareness, and secrets. Eight questions, 80% to pass.

What week 1 covered

Lesson	Concept	Key syntax
1	Push vs pull	tradeoffs by latency / burstiness / infra
2	Webhook payload	`json.loads(s)` + `.get(k, {})` chains
3	HMAC verification	`hmac.new(secret, payload, hashlib.sha256).hexdigest()` + `hmac.compare_digest`
4	Event dispatch	dict-of-handlers, default branch
5	Event idempotency	`set` of processed IDs, mark after success
6	Webhook + state	discover spreadsheet, append parsed event

All of week 1's verification (lessons 2-5) ran on string payloads — the engine doesn't receive HTTP. Lesson 6 is the first true side_effect.

Week 2 = requests, rate limits, secrets.

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Day 8 · ~11 min●

Week 2 moves to direct HTTP, rate-limit awareness, and secrets. Eight questions, 80% to pass.

What week 1 covered

Lesson	Concept	Key syntax
1	Push vs pull	tradeoffs by latency / burstiness / infra
2	Webhook payload	`json.loads(s)` + `.get(k, {})` chains
3	HMAC verification	`hmac.new(secret, payload, hashlib.sha256).hexdigest()` + `hmac.compare_digest`
4	Event dispatch	dict-of-handlers, default branch
5	Event idempotency	`set` of processed IDs, mark after success
6	Webhook + state	discover spreadsheet, append parsed event

All of week 1's verification (lessons 2-5) ran on string payloads — the engine doesn't receive HTTP. Lesson 6 is the first true side_effect.

Week 2 = requests, rate limits, secrets.

What week 1 covered

Lesson	Concept	Key syntax
1	Push vs pull	tradeoffs by latency / burstiness / infra
2	Webhook payload	`json.loads(s)` + `.get(k, {})` chains
3	HMAC verification	`hmac.new(secret, payload, hashlib.sha256).hexdigest()` + `hmac.compare_digest`
4	Event dispatch	dict-of-handlers, default branch
5	Event idempotency	`set` of processed IDs, mark after success
6	Webhook + state	discover spreadsheet, append parsed event

All of week 1's verification (lessons 2-5) ran on string payloads — the engine doesn't receive HTTP. Lesson 6 is the first true side_effect.

Week 2 = requests, rate limits, secrets.

What week 1 covered

Lesson	Concept	Key syntax
1	Push vs pull	tradeoffs by latency / burstiness / infra
2	Webhook payload	`json.loads(s)` + `.get(k, {})` chains
3	HMAC verification	`hmac.new(secret, payload, hashlib.sha256).hexdigest()` + `hmac.compare_digest`
4	Event dispatch	dict-of-handlers, default branch
5	Event idempotency	`set` of processed IDs, mark after success
6	Webhook + state	discover spreadsheet, append parsed event

All of week 1's verification (lessons 2-5) ran on string payloads — the engine doesn't receive HTTP. Lesson 6 is the first true side_effect.

Week 2 = requests, rate limits, secrets.