Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're connected to WiFi, the icon shows full bars, but websites won't load. This usually...

When a Node.js process crashes with FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - Ja...

How to Fix Node.js Heap Out of Memory in VS Code
If you see FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaS...

Bluetooth Hardware Not Found on Windows 11: Fixes
You open Bluetooth settings in Windows 11 and see 'Bluetooth hardware not found' – no swi...

How to Fix VS Code Terminal Not Opening
If you click the terminal panel in VS Code and nothing appears, or it opens but stays blank, the ...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM
You're seeing upstream connection refused in your Nginx error log, and your site...