How can I troubleshoot "Permission Denied" error while trying to install a package globally using npm?

Before we dive into the potential solutions, one thing to keep in mind is to avoid using `sudo` with `npm` to prevent potential permission issues. What you should do instead is to change npm's default directory to a user-specific directory with a command such as `npm config set prefix ~/.npm-global`. Then, ensure this directory is in your `PATH`, but remember to log out and restart your terminal for the changes to take effect.

If you still face issues, check for directory permissions by running the command `npm ls -g --depth=0`. You can also use nvm to manage npm without requiring elevated permissions.