Real apps break: a deploy crashes the site, 1,000 people arrive at once, an API key ends up on GitHub. Learn the calm, professional playbook — triage, read the logs, roll back, fix the root cause, handle traffic spikes, respond to a leaked secret in minutes, and write a blameless post-mortem so it never happens again.
5
units
12
lessons
29
challenges
~35
minutes
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Outcomes
Triage an incident: severity, communication and first steps
Read logs and error messages to find the real cause
Recover from a crash: roll back, fix forward, verify
Keep an app alive under 1,000+ requests: caching, queues, rate limits, scaling
Respond to an exposed API key: revoke, rotate, audit, prevent
Write a blameless post-mortem and set up monitoring and backups
How it works
Every lesson mixes short explanations with hands-on challenges. Get instant feedback, fix mistakes on the spot, and build a daily habit that actually sticks.
Concept cards
Short, clear explanations with real examples
28 in this course
Multiple choice
Pick the right answer, get instant feedback
12 in this course
Fill the blank
Complete formulas, commands and shortcuts
6 in this course
Build it
Arrange tiles into the right sequence
4 in this course
Match pairs
Connect shortcuts, terms and meanings
7 in this course
Daily streaks
Keep the flame alive by learning every day
XP & daily goals
Pick a goal from 10 to 50 XP a day
Hearts
Five per lesson; missed questions come back
Leaderboard
Climb the weekly rankings
Syllabus
What is an incident?
Detect, triage, communicate — then fix.
Reading logs and errors
The error message usually tells you where to look.
The first 15 minutes of a crash
Is it everyone? What changed? Roll back.
Common crash causes and fixes
Most crashes come from the same few things.
When a mobile app crashes
Crash reports, hotfixes and staged rollouts.
What happens under heavy traffic
Find the bottleneck before it finds you.
Handling 1,000+ requests
Cache, queue, index, limit, scale.
Real traffic or an attack?
Rate limits, WAFs and DDoS basics.
Your API key leaked: the first hour
Revoke, rotate, check the damage.
Never leak a secret again
.env, .gitignore, scanning and least privilege.
The blameless post-mortem
Fix the system, not the person.
Monitoring, backups and prevention
Find out before your users do.
Complete every lesson to receive a Learnix certificate with a unique number anyone can verify online.
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