[API]what is the most didactic for beginning?

[yukiti]

I want to start to work with any API.
What suggest for me?

[Zaita]

Possibly Windows API. Unless you have an application or library you wish to interface with.

[Mal Reynolds]

if you are choosing any API, I second zaita, go with the win32 API. here's a basic tutorial, but if you are serious about learning it, also get a hold of Charles Petzold's book "Programming Windows" and look at the online MSDN library.

http://www.winprog.org/tutorial/ : TheForgers Win32 API tutorial