What is the best practice for managing permissions for data files accessed by Jupyter Notebook?

The best practice is to store your data files in directories that are accessible by the user running your Jupyter Notebook. For shared projects or sensitive data, ensure that the specific user account running Jupyter has only the necessary permissions (e.g., read-only if that's all that's required) for the data directories. Avoid storing sensitive data in system-wide directories unless absolutely necessary, and always ensure proper access controls are in place.