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 appears, or it opens but stays blank, the ...

You start your PC after a Windows 11 update and get a blue screen, then it rolls back. This artic...

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

You open Command Prompt, type python, and see 'python' is not recogniz...

Fix Nginx Configuration Test Failure on Location Directive
When you run nginx -t and see an error like [emerg] invalid location directive...

Fixing Nginx 502 Bad Gateway in Docker Networks
You have an Nginx container proxying requests to another container (like a PHP-FPM or Node app), ...