Configuring logging
In previous versions of ASP.NET Core (pre-2.0), logging was configured in Startup.cs. As a reminder, since version 2.0, the Startup.cs file has been simplified, and a lot of configurations were moved to default WebHostBuilder, which is called in Program.cs. Also, logging was moved to default WebHostBuilder.
In ASP.NET Core 3.1 and later versions, the Program.cs file gets more generic, and IHostBuilder will be created first. IHostBuilder is pretty useful for bootstrapping an application without all the ASP.NET web stuff. We'll learn a lot more about IHostBuilder later on in the following chapters. With this IHostBuilder, we create IWebHostBuilder to configure ASP.NET Core. In ASP.NET Core 3.1 and later versions, we get IWebHostBuilder with the webBuilder variable:
public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build(...
