In this tutorial, learn how to secure Azure Functions with Azure AD using the Microsoft.Identity.Web library to validate tokens and authorize access. The tutorial includes a sample project available on GitHub and prerequisites like an Azure subscription, Azure Active Directory, and .NET 6. Learn about the known issues with .NET 6, Azure Functions v4, and Microsoft.Identity.Web, and the necessary updates to the csproj file. Follow step-by-step instructions to create the project and necessary middleware code using the .NET command line with the M.I.W. extension.