Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You run git push and get ! [rejected] with non-fast-forward

Fix VS Code IntelliSense Not Showing Suggestions
You're typing code in VS Code, expecting autocomplete suggestions, but nothing appears. This ...

Fix Nginx Permission Denied on Configuration File
When Nginx reports permission denied while reading a configuration file, the service...

Fix 'Python Virtual Environment Activate Command Not Found'
When you try to activate a Python virtual environment with source venv/bin/activate ...

Node.js Heap Out of Memory in Production: Practical Fixes
You're running a Node.js application in production when it crashes with FATAL ERROR: In...

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