When using the [Authorize] attribute with policies, the specified policy name must be previously registered in the ConfigureServices method within the Startup.cs file. This is where you define and configure your authorization policies, associating them with specific requirements and roles.

In ASP.NET Core Entity Framework, you should override the OnModelCreating method in the DbContext class. This method allows you to configure the database model, define relationships, and apply various constraints using Fluent API or data annotations.

The [FromRoute] attribute is used to bind a route parameter to an action method parameter in ASP.NET Core. If you want to enforce that the parameter should be of a specific type, like integer, you can add the appropriate data type constraint in your action method's parameter using C# data type annotations.

In the context of older versions of ASP.NET, "Master Pages" were used to define a consistent layout for web pages. They allowed developers to create a template or master layout that contained the common structure and elements shared by multiple pages, similar to Razor Layout Views in ASP.NET Core. Master Pages helped maintain a uniform appearance across a website.

The "Worker Service" template in ASP.NET Core is tailored for background processing tasks, such as scheduled jobs, message processing, and other non-HTTP tasks. It doesn't include the typical web application features like HTTP endpoints, controllers, or views, making it ideal for scenarios where you don't need to handle HTTP requests.

Implementing email confirmation in ASP.NET Core Identity involves several steps. You need to configure an email service, update the Startup.cs to include email settings, send a confirmation link to the user's email, and add a ConfirmEmailAsync method to confirm the email address when the link is clicked.

To specify multiple roles using the [Authorize] attribute, you can separate them with commas inside the Roles parameter, like this: [Authorize(Roles = "Admin, Manager")]. This allows access to the action or controller for users who belong to either the "Admin" role or the "Manager" role or both.

The Separation of Concerns (SoC) is a fundamental design principle in ASP.NET Core MVC. It advocates for dividing the application into distinct and separate components, where the Model handles data, the View manages the presentation, and the Controller orchestrates the flow of data between them. This separation enhances maintainability, testability, and scalability.

Razor Layout Views in ASP.NET Core are primarily used to define the common structure or layout that multiple Razor views within your application will share. This allows you to maintain a consistent look and feel across various parts of your web application. They help separate the presentation logic from the content-specific views.

To create a new ASP.NET Core MVC project, you would typically use an integrated development environment (IDE) like 'Visual Studio Code.' Visual Studio Code provides excellent support for ASP.NET Core development, including project templates and extensions that streamline the development process.