You've now been introduced to the world of neural networks, there is so much more to learn about though!
There are several directions you could go from here, here are just a few
- Apply a neural network to another dataset
- Learn about the theory behind neural networks
- I recommend Andrew Ng's Deep Learning Course on Coursera, you can watch the lectures for free
- Learn about other types of neural networks. i.e. Convolutional Neural Networks, Recurrent Neural Networks, etc.