Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see errors like Module build failed: Error: Node Sass does not yet support your curr...

Nginx Upstream Connection Refused: Diagnosis and Fixes
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix npm run build Failed on macOS: Common Causes and Solutions
If you're on macOS and npm run build fails, you're not alone. This command o...

Fix Nginx Configuration Test Failure After SSL Setup
You've just added SSL certificates to your Nginx server block, but nginx -t retu...

Fix Windows Update Service Not Running with Malwarebytes
If Windows Update fails with error messages like "Service not running" or "Windows Up...

Fix Git Merge Conflicts When Stash Changes Are Involved
You're mid-merge, and Git tells you there's a conflict. But you also have stashed changes...