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

Git Detached HEAD vs Attached HEAD: What It Means and How to Fix

If you've seen the message "You are in 'detached HEAD' state" while using Git...

How to Restore Missing Windows Taskbar Icons

You open Windows and notice some taskbar icons are gone—maybe the volume, network, or battery ico...

Docker Pull Access Denied After Login: How to Fix

You run docker pull myimage after logging in with docker login, but get...

Docker Compose Env Variable Not Available in Container: Fix

You define an environment variable in your docker-compose.yml file, but when you run...

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 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...