Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You run git stash and see: fatal: Unable to create 'path/.git/index.lock&#...

Docker Compose Ports Not Working: Common Fixes
You've defined ports in your docker-compose.yml, but containers aren't reachable on the e...

Python Virtual Environment Not Activating on Mac: Fixes
You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...

Fix Nginx Upstream Connection Refused Error
When Nginx returns upstream connection refused in your error logs, it means Nginx tr...

Fix 'docker network not found' After Prune
If you run docker network prune and later see errors like network not found

Fix Nginx Permission Denied on Configuration File
When Nginx reports permission denied while reading a configuration file, the service...