Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You've updated a dependency in pyproject.toml, and now pip install ...

You're running a Python script that logs data, and suddenly you see a UnicodeDecodeErro...

Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

How to Fix Git Merge Unrelated Histories Error
You run git pull or git merge and get:
fatal: refusing to...

Fix Cloudflare Wildcard Subdomain Origin Server Errors
You set up a wildcard DNS record in Cloudflare (e.g., *.example.com) pointing to you...

How to Recover from Detached HEAD in Git
You're working in a Git repository and suddenly see a message like 'You are in 'detac...