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.

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.

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.

ASP.NET Core utilizes NuGet packages for its dependencies, unlike the monolithic System.Web.dll used in traditional ASP.NET. NuGet packages allow for a more modular and granular approach to including libraries, reducing the size of your application and making it more efficient.

To capture the language segment as part of the URL, you can use route parameters like {language} in your route templates. For example, the route template "{language}/Home" will capture the language segment from URLs like /en-US/Home and /fr-FR/Home.

For building cross-platform web applications that can run on both Windows and Linux servers, ASP.NET Core is the ideal choice. Unlike ASP.NET Framework, ASP.NET Core is designed to be cross-platform, lightweight, and high-performance, making it suitable for modern, cloud-native applications.

To display validation errors on an ASP.NET Core registration view, you can use the ValidationMessage tag helper. It's used to show error messages associated with model validation errors and provides a user-friendly way to communicate validation issues to users during the registration process.

In Razor, you use the @layout directive followed by the path to the layout file to define a consistent page structure across views. This allows you to create a shared layout that can be used for multiple views, ensuring a consistent look and feel for your application.

For an ASP.NET Core MVC application to handle incoming HTTP requests and direct them to the appropriate controllers and actions, it must be configured to use the "Routing" middleware. Routing middleware determines how URLs are matched to controller actions, making it a critical part of request handling in MVC applications.

Serving static files in a web application primarily aims to improve performance. By serving assets like CSS and JavaScript directly to the client's browser, it reduces the server's load and enhances the website's loading speed. This results in a better user experience and improved website performance.

You can extend the default IdentityUser class by creating a new class that inherits from it and adding the desired properties. This allows you to store additional information about the user in the same database table as the IdentityUser, providing a seamless integration with ASP.NET Core Identity.

Visual Studio is one of the most commonly used Integrated Development Environments (IDEs) by ASP.NET Core developers. It provides a robust set of tools and features for creating, testing, and deploying ASP.NET Core applications, making it a popular choice in the developer community.