Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're working in VS Code on Linux, try to push or pull, and get a popup: "Git authentica...

When running docker-compose up, you may see an error like Error: Port 8080 is ...

Fix Git 'index.lock' File Exists Error in IntelliJ
If you see an error like fatal: Unable to create 'project/.git/index.lock': File ex...

How to Fix Cloudflare 522 Errors: Connection Timeout Guide
You're trying to load your site and see Error 522: Connection Timed Out. Thi...

Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

How to Use Git LFS Track for Large Files
If you've ever tried to push a repository containing large binary files—like design assets, d...