Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're on a modern Linux distribution and see error: externally-managed-environment<...

Fix VS Code Permission Denied Error on Windows 11
If you see "permission denied" when saving files, running terminals, or using extensions ...

Fix Firefox Secure Connection Failed Due to Proxy Settings
If you see "Secure Connection Failed" in Firefox and suspect a proxy is involved, you'...

Fix VS Code Terminal Not Opening with Docker
If your VS Code terminal refuses to open when Docker is running or after installing Docker extens...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM
You're seeing upstream connection refused in your Nginx error log, and your site...

Fix NET::ERR_CERT_AUTHORITY_INVALID on Windows 10
You're browsing in Chrome or Edge and see NET::ERR_CERT_AUTHORITY_INVALID. T...