In Entity Framework Core, you use both Data Annotations and Fluent API to represent and configure the database tables and relationships. Data Annotations provide a way to define metadata directly in your entity classes using attributes, while Fluent API allows you to configure the database schema and relationships using a fluent and code-based approach. This flexibility allows for fine-grained control over the database mapping.

ASP.NET Core applies migrations in the order they were created, from the oldest to the newest. This ensures that the database schema evolves in a predictable and controlled manner.

The organizational structure of "Controllers," "Models," and "Views" in an ASP.NET Core project is indicative of the Model-View-Controller (MVC) design pattern. MVC separates an application into three interconnected components, making it easier to manage and maintain code. Controllers handle user requests, Models manage data and business logic, and Views handle user interfaces.

To allow users to reset their passwords using an email link, you would need to utilize the EmailSender feature in ASP.NET Core Identity. This involves sending a password reset email with a secure token that users can use to reset their passwords securely.

To include client-side libraries in an ASP.NET Core project, a developer would typically modify the ".csproj" (C# project) file. This file contains references to NuGet packages, project dependencies, and other configuration settings, including client-side libraries like JavaScript or CSS files. Modifying the ".csproj" file allows you to manage these dependencies effectively.

Before the introduction of .csproj in .NET Core 2.0 and later, the project configuration was defined using the project.json file. This file contained information about dependencies, target frameworks, and other project-specific settings. However, with the transition to .csproj files, project.json was replaced, and project configuration became part of the .csproj file and associated .csproj.user files.

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.

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.