Practical fixes for tool errors, setup blocks, and workflow issues.

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

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

fatal: Unable to create &#...

How to Fix Git Merge Conflict Permission Denied Errors

You're in the middle of a git merge, and instead of the usual conflict markers, you see

Fix 'Port Already Used by Another Container' in Docker Compose

When you run docker compose up and see an error like port is already allocated...