Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You open VS Code's settings.json (either user or workspace), make a change, and try to save. ...

You're processing a large text file in Python, and suddenly you hit a MemoryError

Fix VS Code Breakpoint Not Hit in Express App
You set a breakpoint in your Express route handler, start debugging, and the breakpoint is never ...

Fix Nginx Upstream Connection Refused Timeout Error
When Nginx returns 502 Bad Gateway or logs upstream connection refused timeout...

Fix Windows Security App Missing from Start Menu
You open the Start menu, type “Windows Security,” but nothing appears. The app may have been unre...

How to Fix Nginx Configuration Test Failed Error
When you run nginx -t and see "test failed", it means nginx found a problem ...