Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

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Latest checklists

You add a proxy_pass directive to an Nginx server block, run nginx -t, ...

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Handling Python Memory Errors with Large File Chunking
You're running a Python script that reads a file, and it crashes with MemoryError

Fix Docker Overlay2 Disk Usage and No Space Left Errors
When Docker reports 'no space left on device' or you notice disk usage climbing in ...

Fix pnpm ERR! Cannot Find Module – Practical Steps
When running pnpm install or pnpm start, you might see an error like:

How to Recover from a Detached HEAD in Git After a Rebase
You're in the middle of a rebase, you see a message like 'detached HEAD', and you'...