Create your local Function App
First, create a local Azure Functions application. An Azure Functions app can contain many Functions with various triggers - this tutorial focuses on HTTP triggers, which allow you to handle to incoming HTTP traffic.
In the Activity Bar, click on the Azure logo to show the AZURE Functions explorer and click the Create Project icon.
When prompted, choose Open in current window and VS Code will reload with your new Functions app in the workspace.
Next, add an HTTP trigger Function to your app.