Knowledge base for software setup, errors, and daily tool work.

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

Fix Discord Black Screen from Chrome Hardware Acceleration

Why Chrome Hardware Acceleration Causes Discord Black Screen

When Chrome uses hardware a...

Renew an Expired Cloudflare Origin Certificate: Step-by-Step

If your Cloudflare origin certificate has expired, visitors will see SSL errors and your server m...

Cloudflare SSL Full Strict Troubleshooting Steps

If you have set Cloudflare SSL/TLS encryption to Full (strict) and your site shows errors like 52...

Fix Cloudflare Wildcard Subdomain Not Working

If you've set up a wildcard DNS record in Cloudflare (e.g., *.example.com) but s...

How to Fix Cloudflare Origin Certificate Validation Failed

If you see a "validation failed" error when setting up or using a Cloudflare Origin Certi...