This seems to be a good introduction if you like to learn by reading while building something: http://neuralnetworksanddeeplearning.com http://neuralnetworksand

This seems to be a good introduction if you like to learn by reading while building something: http://neuralnetworksanddeeplearning.com http://neuralnetworksanddeeplearning.com It basically walks you through building a neural net that can make sense of hand written digits.