Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see error code 0x00000001 when trying to turn on Bluetooth or pair a device in Windows 11,...

You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...

You're installing a package with pip, and suddenly you see a wall of red text: ERROR: C...

Fix 'Python' Command Not Found on Windows 7
When you type python in Command Prompt on Windows 7 and get 'python' i...

Fix Nginx 'Permission Denied' Upstream Errors
When Nginx logs permission denied while connecting to an upstream (e.g., a Unix sock...

Fix Python Venv Not Activating in PowerShell
You open PowerShell, navigate to your project, and run venv\Scripts\activate but not...