ASP.NET Core is a successor to the ASP.NET MVC framework. While ASP.NET Web Forms and Classic ASP were earlier web development technologies from Microsoft, ASP.NET Core represents a more modern and flexible approach to web development.

ASP.NET Core achieves modularity through the extensive use of NuGet packages. This means that various components and libraries are organized as packages, making it easy to update, replace, or extend specific parts of the framework without affecting the entire application. This is a significant departure from the monolithic architecture of its predecessor, which had tightly coupled components and fewer modular options.

The Attach method in Entity Framework Core is primarily used for tracking changes made to an entity. When you attach an entity, EF Core starts tracking it, and any changes made to that entity will be detected and persisted when you call SaveChanges. This is especially useful when you want to work with entities that have been detached from the context.

The most probable cause of a 404 error when accessing an action method is incorrect route configuration. Ensure that the route for the "Details" action method in the "Products" controller is properly configured to accept the required parameters, such as the product ID (e.g., "{controller}/{action}/{id}").

To create a textbox for user input in a Razor view, you would use the asp-textbox tag helper. This helper generates the necessary HTML input element, and you can specify its attributes and bindings using the asp-for attribute. It's a handy tool for creating forms in ASP.NET Core views.

One of the common reasons for missing images and stylesheets in a web application is incorrect file paths or URLs. Check that the paths specified in your HTML or CSS files are accurate and relative to the 'wwwroot' folder.

The {id:int} syntax in an attribute route specifies that the id parameter must be of type integer. This is a way to ensure that the data passed in the URL is an integer value, and if it's not, the route won't match.

The Worker template in ASP.NET Core is specifically designed for projects that focus on background tasks. It's ideal for creating services that perform work in the background and can be run as Windows services or Linux daemons. This template provides the necessary infrastructure for background task execution.

The main difference is that Database.EnsureCreated() creates a database without tracking schema changes, often used for development or unit testing, whereas migrations provide version control for your database schema, allowing you to apply, rollback, and manage changes over time.

Continuous Delivery is a software development practice where changes are automatically tested and prepared for release to production. It includes automated testing, deployment, and delivery of code changes.