Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You connect to WiFi, see full bars, but websites won't load. This is common on Windows 11. Th...

If you see the error error: externally-managed-environment when running pip in...

How to Fix 'fatal: refusing to merge unrelated histories' in Git
If you see fatal: refusing to merge unrelated histories when running git merge...

How to Fix Git Merge Conflict Permission Denied Errors
You're in the middle of a git merge, and instead of the usual conflict markers, you see

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'...