Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You run pip install and see errors like “package A requires package B==1.0 but y...

Fix Cloudflare Wildcard Subdomain and Root Domain Conflict
If you use a wildcard DNS record (e.g., *.example.com) on Cloudflare, you may run in...

Windows 11 Update Stuck at 0%? Here's How to Fix It
You click "Check for updates" and see the download sitting at 0% for minutes or hours. Th...

Docker Compose Secret vs Environment Variable: When to Use Each
If you're writing a docker-compose.yml and wondering whether to put a value in <...

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 pip Externally Managed Environment on Debian 12
If you're on Debian 12 and get error: externally-managed-environment when using ...