Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When installing Python packages with pip, you might see an error ending with exit code 1

Fix Windows Update Error 0x80070002
Windows Update error 0x80070002 usually appears during an update attempt. The system may stall at...

Fix Nginx 502 Bad Gateway with Docker and PHP-FPM
You have a Docker setup with Nginx proxying to a PHP-FPM container, and you're getting a 502 ...

Fix Docker Compose Port Allocation Errors
When you run docker compose up and see an error like "port is already alloca...

Fixing VS Code 'Permission Denied' Errors on All Files
If VS Code shows 'permission denied' for every file you try to open or edit, the problem ...

Fixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...