Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...

You open Windows Security, go to Virus & threat protection, and see Real-time protection stuc...

If you see node-sass build failed python not found when running npm install

Fix pnpm Not Working After Node.js Update
After updating Node.js, you may find that pnpm commands fail with errors like command not f...

Git Merge --allow-unrelated-histories: When and How to Use It
You run git merge and get an error: fatal: refusing to merge unrelated histories...

Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused