Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you see fatal: unable to access 'https://...': SSL certificate problem: unable...

How to Recover from a Detached HEAD in Git After a Rebase
You're in the middle of a rebase, you see a message like 'detached HEAD', and you'...

Fix Python Permission Denied When Installing Packages
You try to install a Python package with pip and get a PermissionError: [Errno 13] Permissi...

VS Code Git Changes Not Detected After Save: Fixes
You save a file in VS Code, but the Source Control panel shows no changes. The file doesn't a...

Fix Docker Nginx 502 Bad Gateway Upstream Error
When running Nginx as a reverse proxy in Docker, a 502 Bad Gateway error with 'upstream' ...

How to Bypass pip's Externally Managed Environment Error
When you run pip install on certain Linux distributions (like Debian 12, Ubuntu 23.0...