Thoughts on how to play against 1.d4?

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piratebt99chess

I usually play 1...d5 against d4 but I really don't like playing these positions. 

piratebt99chess

As black I feel kind of cramped. I dabbled with the QGA but again didn't like this.

piratebt99chess

Now I'm playing 1...Nf6 but there is just so much to learn, I don't know where to start.

piratebt99chess

All I know is that I like the grunfeld exchange.