How do you make hacks?

Hey guys, im a total noob at programming and everything but I'd like to learn. How do you make hacks, like the .dll files? I'd like to know how to make an injector too but that's not as important to me. I'm sorry if this has been asked a lot before or if there's a tutorial or something posted.

But like to make a hack for SANA, how would I do that? thanks in advance