Understanding the Program.cs file
The Program.cs file, located in the Web project's root folder, is responsible for executing the Main method, which serves as the app's entry point and starts the application.
The following code is present inside the Program.cs file, and we will break it down into digestible content:
namespace Web
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }
        public static IHostBuilder CreateHostBuilder(string[]         args) =>
            Host.CreateDefaultBuilder(args)
  ...
