This tutorial teaches how to set up email alerting in a Flask application using SendGrid, allowing the application to send an email alert to an admin when unhandled exceptions occur. To achieve this, the tutorial requires access to Python 3.6 or newer, a Twilio SendGrid account, and the installation of necessary packages such as Flask, python-dotenv, and the official Twilio SendGrid Python API client. The tutorial guides through setting up the SendGrid account, creating a virtual environment for the project, writing the code for the basic Flask application, configuring alerts with SendGrid, hooking into unhandled exceptions, sending the alert email with SendGrid, and testing the alerts. By following this tutorial, developers can create a handy alerting system to monitor their Flask applications' failures.