AspNetCore.Docs/aspnetcore/includes/template-files.md

• Startup.cs : Startup Class - class configures the request pipeline that handles all requests made to the application.
• Program.cs : Program Class that contains the Main entry point of the application.
• firstapp.csproj : Project file MSBuild Project file format for ASP.NET Core applications. Contains Project to Project references, NuGet References and other project related items.
• appsettings.json / appsettings.Development.json : Environment base app settings configuration file. See Configuration.
• bower.json : Bower package dependencies for the project.
• .bowerrc : Bower configuration file which defines where to install the components when Bower downloads the assets.
• bundleconfig.json : configuration files for bundling and minifying front-end JavaScript and CSS assets.
• Views : Contains the Razor views. Views are the components that display the app's user interface (UI). Generally, this UI displays the model data.
• Controllers : Contains MVC Controllers, initially HomeController.cs. Controllers are classes that handle browser requests.
• wwwroot : Web application root folder.

For more information see The MVC pattern.