Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When running docker-compose up, you may see an error like Error starting userl...

Fix Windows 11 Update Stuck at 0% – BITS Service Issues
You click 'Check for updates' in Windows 11, and it sits at 0% for minutes or hours. Ofte...

Fix Cloudflare 521 Error: SSL Configuration Steps
If you see a Cloudflare 521 error, it means Cloudflare can't establish a TCP connection to yo...

Fix VSCode Breakpoints Not Hit in launch.json
You set a breakpoint in Visual Studio Code, start debugging with a launch.json confi...

Fix npm install Permission Denied in Home Directory
If you see EACCES: permission denied or similar errors when running npm instal...

Cloudflare Origin Certificate Setup Checklist
You've set up Cloudflare but your origin server still shows SSL errors or mixed content warni...