Get the theory you need to play violin. Become a player who is cognizant of the 'feel' of music from knowing the theory behind it. Playing violin is, after all, about emotion, but rare is the player who feeds his emotion with theory.
That is because theory has a bad rap. It's not stodgy, it's not tricky, but it is fun.
Take your playing to the next level and learn to have fun with basic music theory specifically crafted for violin!