ASP.NET Core is an open-source(link), cross-platform, and free platform, which mainly targets run on .NET Core.

ASP.NET Core 3.x only runs on the .NET Core 3.x, whereas ASP.NET Core 2.x runs on .NET Core 2.x as well as .NET Core Framework. more information looks .NET standard.

Run the first ASP.NET Core 3.x Application.

You can run an ASP.NET Core application on Visual Studio as well as on CLI.

On Visual Studio

Download the Visual Studio 2019 editor. If you want to build a different .Net core application, you need to choose a different version. Bellow is the minimum required version of Visual Studio based on the target visual studio version. more

Open Visual Studio 2019, choose create a new project

Choose ASP.NET Core Web Application

Enter your project name and choose the project location

Choose a version and a project template

Here, we chose the ASP.NET Core MVC Views as our template.

Press F5, Start debugging.

On CLI

You can also run this project through CLI, open a command prompt and enter the following code.

dotnet new webapp -o aspnetcoreapp

Trust the development certificate

dotnet dev-certs https --trust

Run the App

cd aspnetcoreapp
dotnet watch run

Then, open https://localhost:5001/ in your browser.

The above code creates a MVC Project, However, there are two project examples, one is MVC, another is Razor. Both are a complete ASP.NET Core project, they are good projects for a newbie. MVC booklist project and Razor Booklist project.