Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see a message like “You are in ‘detached HEAD’ state” in IntelliJ IDEA, it means your work...

Windows Defender real-time protection sometimes gets disabled by group policies, third-party anti...

You install or update a Chrome extension, but it refuses to load. Instead, you see a Perm...

Fix Docker Nginx 502 Bad Gateway with MySQL
You have a Dockerized web app behind Nginx, and you're seeing a 502 Bad Gateway error. The ap...

Fix Nginx Upstream Connection Refused Error
If you see upstream connection refused in your Nginx error logs, it means Nginx trie...

Fix 'Permission Denied' in VS Code Terminal for Python
You're in VS Code, you open the terminal, type python script.py, and get p...