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

How to Fix Git Detached HEAD State and Undo Changes

You run git status and see something like "HEAD detached at abc123". This ha...

Windows 11 Update Stuck at 0% in Safe Mode: How to Fix

You boot into Safe Mode to troubleshoot a problem, but Windows Update shows 0% and won't budg...

Cloudflare SSL Full vs Flexible: Troubleshooting Mixed Content & Errors

If your site shows broken padlocks, mixed content warnings, or SSL errors after changing Cloudfla...

Fix Docker Nginx 502 Bad Gateway Upstream Error

When running Nginx as a reverse proxy in Docker, a 502 Bad Gateway error with 'upstream' ...

Fix Nginx Redirect Loop After SSL Certificate Install

You installed an SSL certificate, and now your site redirects in a loop. The browser shows 'E...

Fix Nginx Permission Denied for Static Files

Common Causes

When Nginx returns a 403 Forbidden or 'permission denied' error for...