Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you run git push and get an error like ! [rejected] main -> main (non-...

Fix npm run build Failure from Missing Env Variables
You run npm run build and get an error like Error: Missing required environmen...

How to Fix VS Code IntelliSense Not Working
If you're seeing no suggestions, missing completions, or a spinning 'Loading...' in V...

Checklist for Troubleshooting Nginx Permission Denied Errors
Understanding the Problem
When Nginx returns a 403 Forbidden or logs an error like ...

Chrome Certificate Error Invalid Authority: Diagnosis Checklist
When Chrome shows NET::ERR_CERT_AUTHORITY_INVALID and refuses to load a site, it...

Fix 'Permission Denied' When Activating Python venv
When you try to activate a Python virtual environment with source venv/bin/activate ...