Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see "Authentication failed" when pushing or pulling in Visual Studio Code on Windo...

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

Docker Network Not Found But Exists: How to Fix
You run a Docker container and get an error like docker: Error response from daemon: networ...

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

Fix Node.js Heap Out of Memory Error in PM2
If you're running a Node.js application under PM2 and seeing FATAL ERROR: CALL_AND_RETR...

Activate Python Virtual Environment in VS Code
You've created a Python virtual environment but can't get VS Code to use it. The terminal...