Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You've made commits while in a detached HEAD state, and now you can't see them on any bra...

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Cloudflare Wildcard Subdomain Troubleshooting Checklist
When you set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, subdomain...

Fix Python UnicodeDecodeError 'charmap' Codec
You're reading a file in Python and get:
UnicodeDecodeError: 'charmap' ...

Fix 'npm package json not found' Error When Using npx
When you run npx some-package and see an error like “npm package json not found”...

Fixing Git Authentication Failed in VS Code
If you see "git authentication failed" when pulling, pushing, or cloning in VS Code, the ...