In this tutorial, we are going to learn how to create a Asp.NET Core 3.0 trimmed self-contained app using visual studio code. In this way we can share our application without installing .NET SDK on the target machine. So, first-of-all, we will create an Asp.Net Core 3.0 app, then we will publish it as self-contained app and then we will see how to reduce the files using PublishSingleFile flag and then we will see how to reduce the size of executable using PublishTrimmed flag which is a new feature of .NET Core 3.0 Preview 6.