The RefreshSignInAsync method can be used to refresh the sign-in information of a user in scenarios like role updates or other security-sensitive operations. This method generates a new security token for the user, helping to prevent token-based attacks and ensuring the user's session remains secure.

To ensure that Entity Framework Core doesn't throw detailed database errors to the client, you should use "Exception Handling Middleware." This middleware intercepts exceptions, handles them, and returns a user-friendly error response to the client without exposing sensitive database details.

JWT or JSON Web Tokens are often used in conjunction with the Bearer authentication scheme in ASP.NET Core. The Bearer scheme is commonly used to secure APIs and web applications, where a client includes a JWT token in the HTTP Authorization header to authenticate and authorize their requests. This scheme is based on the bearer token concept, where possession of the token is sufficient for authentication.

In advanced routing scenarios where the built-in routing capabilities of ASP.NET Core are insufficient, developers can leverage the RouteBuilder class. It provides more fine-grained control over route configuration, enabling customization and complex routing setups.

To optimize EF Core queries, you can use a SQL Profiler tool, such as SQL Server Profiler. These tools allow you to capture and review the generated SQL statements, analyze query performance, and identify areas for improvement. It's a crucial step in fine-tuning your application's database interactions.

Routing in ASP.NET Core MVC is primarily responsible for handling incoming HTTP requests and mapping them to the appropriate controller actions. It determines which controller and action method should respond to a particular URL, making it a crucial part of request handling and processing.

In a custom exception handling middleware, you must manually call the next middleware's InvokeAsync(context) method to ensure that the next middleware in the pipeline gets executed. This allows you to catch exceptions, perform custom handling, and then pass control to subsequent middleware components.

While Visual Studio is a full-fledged integrated development environment (IDE), Visual Studio Code (VS Code) is a lightweight, cross-platform code editor that is highly popular among ASP.NET Core developers. VS Code offers extensions and plugins that make it suitable for ASP.NET Core development, and it's known for its speed and versatility.

In ASP.NET Core Razor views, you can define namespaces that should be used across multiple views in the _ViewImports.cshtml file. This helps avoid repetitive code by making the namespaces available globally within the project's views.

One of the main criticisms of project.json was its limited MSBuild integration. This made it challenging to integrate with existing build systems and tools, leading to its replacement with the more MSBuild-oriented csproj format in ASP.NET Core.