This tutorial provides a step-by-step guide on how to receive faxes using Twilio's Programmable Fax service, Python 3, and Flask. The process involves setting up a virtual environment, installing necessary libraries, configuring the Flask application, and integrating it with Twilio's fax service. The application uses ngrok to expose the web service to the internet and validate incoming requests from Twilio servers. Once configured, the application can receive faxes sent via email and store them as PDF attachments. The tutorial also highlights security considerations, such as validating cryptographic signatures, and provides recommendations for production deployment.