Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're working with Git on a Mac and see the error fatal: Unable to create '/pat...

npm package.json Not Found: Troubleshooting Checklist
When you run npm install or npm start and see package.json not fo...

Fix Git Pull Unrelated Histories Error: Step-by-Step
You run git pull and see: fatal: refusing to merge unrelated histories....

Fix Cloudflare Wildcard Subdomain DNS Propagation Delay
You set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, but new subdom...

Fix VS Code Permission Denied When Not Admin
You try to save a file or install an extension in VS Code, and get a "permission denied" ...

Fix npm run build Failure from Missing Env Variables
You run npm run build and get an error like Error: Missing required environmen...