It's the first time that I have to use API in ASP.NET Core application and I have no idea about how to use it. I'm a little bit confused. Any lead, help, explanation would be appreciated please.
Thank you!
First learn this link about ASP.NET Core concepts.
Then next learn about Entity Framework Core Learn Entity Framework Core
Then create a todo project for understand concepts asp core according to this link.
Finally read this article Creating ASP.NET Core 2.2 Application Step-by-Step