The tutorial covers creating an ASP.NET Core application using the Twilio SDK for C# and .NET to receive voice calls and play motivational quotations. To get started, a Twilio account is required along with a call-enabled phone number, and ngrok is used to make the app visible on the internet. The application uses TwiML to define instructions for Twilio when an incoming call comes in, including playing a random quote from a predefined list. The tutorial also covers adding packages from Twilio, creating a web API controller, connecting to Twilio, and testing the app. Possible improvements include connecting to a quotations API and randomly selecting a voice.