In an ASP.NET Core project, static files like images, CSS, and JavaScript are typically stored in the "wwwroot" folder. This folder serves as a root for serving static web assets to clients. Placing static files here ensures they can be accessed directly via a web browser, enhancing the performance of your web application.

To pass both product details and a list of related reviews to a view, it's best to use a ViewModel. A ViewModel is a dedicated class that combines the necessary data for a view. This approach keeps your code clean, maintainable, and allows for strong typing in your view.

When you need to create custom constraints for routing in ASP.NET Core, you should implement the IRouteConstraint interface. This interface allows you to define your custom logic to determine if a route is a match or not, providing flexibility in routing scenarios.

ASP.NET Core MVC determines the controller and action to route a request to through URL routing. The routing system maps incoming URLs to controller actions based on predefined route patterns, allowing for a clean and user-friendly URL structure in your web application.

To dynamically choose a Razor view based on runtime conditions, you can use Razor Views with Resource Files. These resource files can store localized versions of your views, and you can switch between them based on the user's language preference.

You should define a namespace that you want to use across multiple Razor views in the _ViewImports.cshtml file. This file is specifically designed to consolidate 'using' directives, making them accessible throughout the views that share it, thereby improving code organization and reusability.

In ASP.NET Core Razor views, Master Pages have been replaced with "Layout Pages." Layout Pages define the overall structure and common elements for views, similar to Master Pages in previous versions of ASP.NET. They provide a consistent layout for multiple views within your application.

In the MVC pattern, the Model is primarily concerned with how the application's data is represented and manipulated. It encapsulates the business logic, data storage, and interactions with the database. It acts as a bridge between the Controller and the View, providing the necessary data to be displayed.

Running tests after developing a new feature to ensure that existing functionality remains unaffected is known as Regression Testing. It helps catch unintended side effects or bugs introduced by new code changes.

In an ASP.NET Core application, the Startup.cs file is where you primarily configure the application's services, middleware pipeline, and other startup-related settings. This is where you can modify how the application behaves during startup.