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 tag helper is a built-in Razor Tag Helper in ASP.NET Core. It is used to generate links and forms with correct routing information, making it easier to create URLs that are strongly typed and route to the appropriate controller actions.

Tag Helpers in Razor views are primarily used for generating HTML elements with server-side logic. They allow you to create dynamic HTML elements and attributes based on server-side data and logic, making it easier to work with server-side data in your 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.

To control access to specific endpoints in an ASP.NET Core Web API, you'd use Authorization Filters. You can apply policies to controllers or actions, and these filters can determine whether a user is authorized to access the resource based on their identity and role. To make some endpoints public, you can use AllowAnonymous attribute or configure policies accordingly.

The "Web Application" template is the suitable choice when you need both Razor-based web pages for user interfaces and API controllers for handling data interactions. This template provides a balanced setup for creating web applications that combine server-rendered Razor pages with APIs for data exchange.