Checklists for software errors, setup, and tool workflows.

Fix Cloudflare Wildcard Subdomain Origin Server Errors

You set up a wildcard DNS record in Cloudflare (e.g., *.example.com) pointing to you...

Fix Cloudflare 521 Error Due to Server Overload

You see a Cloudflare 521 error page. The message says the web server is down. Often, this means y...

Fix Discord Black Screen from Chrome Hardware Acceleration

Why Chrome Hardware Acceleration Causes Discord Black Screen

When Chrome uses hardware a...

Chrome Certificate Error Invalid Authority: Diagnosis Checklist

When Chrome shows NET::ERR_CERT_AUTHORITY_INVALID and refuses to load a site, it...

Fix 'pip install externally managed environment' Error

If you're seeing pip install fail with a message about an externally managed env...

How to Configure pnpm Store Path (and Fix Common Issues)

If you use pnpm, you may run into disk space warnings, permission errors, or duplicate packages. ...