Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

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Latest checklists

You run npm install on Windows 10 and see errors like Error: EPERM: operation ...

Docker Container Exits Immediately: No Error, Common Fixes
You run docker run and the container starts, then exits within a second. No error me...

Nginx Upstream Connection Refused: Diagnosis and Fixes
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix 'npm run build Error Cannot Find Module'
You run npm run build and get an error like Error: Cannot find module 'som...

Fix VS Code Git Authentication Failed Keychain Error
If you see "Git authentication failed" in VS Code on macOS, the problem is often the macO...

Fix 'Python' Command Not Found on Windows 7
When you type python in Command Prompt on Windows 7 and get 'python' i...