Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You see the taskbar at the bottom of your screen, but the icons—like the Start button, search bar...

If your Windows 11 update is stuck at 0% and not progressing, the SoftwareDistribution

Fix npm run build Failed with PostCSS Error
You run npm run build and see a PostCSS error. This often happens after updating pac...

Fix Docker Volume Permission Denied as Root
You start a container as root, mount a volume, and get a 'permission denied' error. This ...

Fix VSCode Permission Denied on Save in Linux
You're editing a file in Visual Studio Code, press Ctrl+S, and see a red error: "Failed t...

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