How do you create a function app?

 To create a function app in Azure, follow these steps:

1. Sign in to the Azure portal.
2. Click on the Create a Resource button.
3. Search for "Function App" and select it from the list of results.
4. Click on the Create button to begin the creation process.
5. Fill in the required information, including the subscription, resource group, and function app name.
6. Choose the operating system, either Windows or Linux, and the hosting plan, either Consumption or App Service Plan.
7. Choose the runtime stack and version, such as Node.js, Python, .NET Core, or Java.
8. Choose the region where you want to deploy the function app.
9. Click on the Create button to create the function app.