The PasswordValidator feature in ASP.NET Core Identity helps enforce password complexity rules, including not allowing users to use their username as their password. It checks for various conditions like length, special characters, and username inclusion.

In ASP.NET Core Identity, the "Password History" option helps enforce password policies by preventing users from reusing recent passwords. It maintains a history of previously used passwords and checks new passwords against this history to ensure they are not reused.

In the URL /Books/Details/3, the "3" is a route parameter. Route parameters allow you to pass data from the URL to your controller actions, making it dynamic and allowing you to retrieve information specific to the value "3."

Exception handling in ASP.NET Core is crucial for maintaining the stability and reliability of applications. It allows developers to gracefully handle errors, provide meaningful error messages to users, and prevent crashes that could otherwise disrupt the user experience.

The UseStaticFiles middleware is responsible for serving static files, such as CSS and images, to clients. If users can't access these files, you might have forgotten to configure this middleware in the Startup.cs file. Ensure you've included app.UseStaticFiles(); in your Configure method to serve these files properly.

ASP.NET Core Web APIs primarily use the JSON (JavaScript Object Notation) format for transmitting data. JSON is lightweight, human-readable, and widely supported, making it a popular choice for APIs.

Attribute routing in ASP.NET Core allows for centralized route configuration, making it easier to define routes for specific actions or controllers directly within the code using attributes. This provides a more intuitive way to specify routes and helps keep routing logic within the controllers where it belongs.

The primary distinction between Visual Studio and Visual Studio Code is that Visual Studio is a full-featured integrated development environment (IDE) with a wide range of features for various types of development, whereas Visual Studio Code is a lightweight, open-source code editor with extensibility for customizing and configuring it according to the developer's needs.

In the context of ASP.NET Core, "lightweight" refers to reduced memory usage and a small download size. ASP.NET Core is designed to use fewer system resources, making it efficient for hosting applications and reducing operational costs. This lightweight nature also allows faster startup times for applications.

To send data to an action method via an HTTP GET request in Razor forms, you can set the method attribute on the form tag to "GET." This tells the browser to include the form data in the URL as query parameters, allowing you to use [HttpGet] attribute on the action method to receive the data.