Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If your Chrome extensions suddenly stop loading or appear grayed out on Windows 10, it's usua...

You installed Python but typing python in Command Prompt returns 'python&#...

Fix 'git remote origin already exists' with Wrong URL
You run git remote add origin <url> and get: fatal: remote origin alread...

Fix VS Code 'Cannot Save File: Permission Denied' on Mac
You're editing a file in VS Code on your Mac, hit save, and get: 'Failed to save:...

Fix VSCode Git Auth Failed: Expired Token
You're working in Visual Studio Code, try to push or pull, and see an error like "Git: Au...

How to Fix Git Detached HEAD State and Undo Changes
You run git status and see something like "HEAD detached at abc123". This ha...