Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you run pip install somepackage on Linux and see Permission denied...

You're in the middle of a Git operation—commit, merge, or rebase—and Git stops with: fa...

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

Docker Network Not Found But Exists: How to Fix
You run a Docker container and get an error like docker: Error response from daemon: networ...

Fixing Nginx Permission Denied for Root Directory
You've set up a new Nginx server block, pointed the root directive to a directory, and when y...

Fix Permission Denied on chmod in VS Code Terminal
You're running chmod in the VS Code integrated terminal and seeing 'permissi...