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

How to Fix a Detached HEAD in Git Using SourceTree

If you open SourceTree and see a message like “You are in ‘detached HEAD’ state,” it means your w...

Fix Windows Security App Blocked by Antivirus

You open Windows Security (formerly Windows Defender) only to see an error or blank screen becaus...

Fix Git Push Rejected Non Fast Forward Error

Cloudflare Origin Certificate Setup for cPanel

If you use Cloudflare as a reverse proxy, you can install a Cloudflare Origin Certificate on your...

Grant Docker Registry Pull Access: Step-by-Step Guide

If you manage a private Docker registry, you often need to give certain users or CI systems the a...

Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome

When Chrome shows 'NET::ERR_CERT_AUTHORITY_INVALID', it means the browser cannot verify t...