Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you click the terminal panel in VS Code and nothing happens, or it opens a blank shell instead...

You open a Java file in VS Code, start typing, and get no code completion, no parameter hints, no...

You run npm install and see: engine "node" is incompatible with this m...

How to Fix Node Engine Version Requirement Errors
When you run npm install or yarn install and see an error like en...

Fix Nginx Upstream Connection Refused Error
When Nginx returns upstream connection refused in your error logs, it means Nginx tr...

Fix Cloudflare Origin Certificate Mismatch Errors
If you see 'Origin Certificate Mismatch' in Cloudflare or browser warnings, it usually me...