Welcome to the Grunfeld Course, which will help you face 1.d4. There are many possible options to play against 1.d4, but the Grunfeld is the one you can go with, and the reason for that is that most of the time it's a structure-based opening, not a memory-based one where you have to learn dozens of variations before playing it.
The main structure for Black is Nf6, g6, d6, Bg7 and 0-0. That's mostly what it looks like for Black. And now let's start!