Where can I find detailed logs or error messages that might help me pinpoint the root cause of a '500 Internal Server Error' from Jupyter Notebook?

The most immediate source of detailed error messages is the console or terminal window from which you launched Jupyter Notebook. Any crash or internal server error information, including Python tracebacks, will typically be printed there. If Jupyter is running as a service, check the service's log files. Additionally, for issues related to specific requests, your browser's developer console (F12, Network tab) might show more specific HTTP request/response details, although the '500' itself points server-side.