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...

How to Reinstall Windows Security App (Microsoft Defender)

If the Windows Security app (Microsoft Defender) is missing, crashing, or not opening, reinstalli...

Using Git LFS Migrate on an Existing Repository

If you have a Git repository that already contains large files—like binaries, archives, or datase...

Fix 'port already allocated' for Nginx in Docker Compose

You're starting your Docker Compose setup with Nginx, and you see "port is already alloca...

Windows Security App Not Opening? Try These Steps

If the Windows Security app won't open, shows a blank screen, or crashes immediately, you'...

Fix Nginx Upstream Connection Refused Socket Error