In ASP.NET Core, the [TestClass] attribute is used to define a test class, and it helps in grouping multiple related test methods within that class. Grouping makes it easier to organize and run tests, especially when dealing with a large number of tests in a project.

In ASP.NET Core, serving static files like HTML, CSS, JavaScript, and images is accomplished using the StaticFiles middleware. This middleware allows you to efficiently serve these files directly without going through the MVC routing system.

To define a shared model type across Razor views, you would use the @inherits directive in the _ViewImports.cshtml file. This directive specifies the base class for all views in the directory, allowing you to set a common model type for those views.

In an ASP.NET Core application, the exception handling middleware is typically configured in the Startup.cs file, specifically in the ConfigureServices method, where services like UseExceptionHandler or UseDeveloperExceptionPage are added to the middleware pipeline.

Azure Monitor is the Azure service designed for monitoring and gaining insights into the performance, health, and usage of applications deployed on Azure, including ASP.NET Core applications. It provides comprehensive monitoring and diagnostic capabilities.

To create users in ASP.NET Core Identity, developers typically interact with the 'UserManager' class. The 'UserManager' provides methods for user management, including user creation, deletion, and more.

When developing a backend service that exclusively returns JSON data for a mobile app, you should start with the Web API template. Web API is specifically designed for building RESTful services that can provide data in formats like JSON, making it a suitable choice for this scenario.

OpenCover is a popular tool used for measuring code coverage in ASP.NET Core projects. It provides insights into which parts of your codebase are covered by unit tests, helping you identify areas that may need additional testing.

To build and run your ASP.NET Core application from the command line, you would use the .NET CLI (Command Line Interface). It's a powerful tool that provides various commands for managing and running your ASP.NET Core projects efficiently.

Shared Razor directives that are meant to be used across multiple views are typically placed in the _ViewStart.cshtml file. This file is executed before any view is rendered and allows you to set common layout or content directives for all views.