I am learning the najdorf but most players at my rating dont play the najdorf they play other variations like grand prix and Nc3. Where can i learn about these lines? books reccomondations? 

Youtube...

I  just learned what the najdorf and dragon were but most of the time I see Nc3 too.

There's the Parham Sicilian: 

I can show you them next weekend if you want. Grand Prix is pretty tricky. It is very agressive. You need to defend carefully as black. The closed sicilian is pretty passive and becomes a positional game. Just play your best, and overtime, you will get used to it

What the point?

Isn't it obvious? It completely refutes the open sicilian before it's even played by restriction of the d-pawn. It also puts pressure on the important a5-e1 diagonal. It's not as dangerous as the main Parham, but you're black.