Choosing the application type

ASP.NET Core provides us different application templates to start developing applications. These templates give us an optimal project structure to keep everything organized. We have the following types:

• Empty: This is simplest form of a project template containing only Program.cs and the Startup.cs class. Due to the complete modular nature of ASP.NET Core, we can upgrade this empty project to any type of web application.
• Web API: This creates the Web API project with controllers, web.config, and so on. Our focus will be on this application template.
• Web Application: This creates an ASP.NET Core MVC type of project with Controllers, Views, client configurations, Startup.cs, and web.config.
• Web Application (Razor pages): This creates an ASP.NET Core web app using the Razor pages.
• Angular, React.js, and React.js with Redux: This creates JavaScript-framework-based ASP.NET Core web applications.

It's not mandatory to follow the template project structure provided by ASP.NET Core. When working on large projects, it's best practice to split them into separate projects for maintainability. The default project structure is good enough to understand the interaction between various components.