Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You set a breakpoint in VS Code while working in a remote environment—SSH, container, or WSL—but ...

You run docker compose up and get an error like Error: Port 3306 is already al...

Docker Compose Env Variable Not Available in Container: Fix
You define an environment variable in your docker-compose.yml file, but when you run...

Fix 'nginx: configuration test failed unexpected end of file'
When running nginx -t or nginx -t -c /path/to/nginx.conf, you might see...

Git Detached HEAD: Practical Checklist and Fixes
You see a message like 'You are in 'detached HEAD' state' when checking out a com...

Fix 'Git Remote Origin Already Exists' Error
When you run git remote add origin <url> and see fatal: remote origin al...