In the last scenario, we created a simple one layered neural network. The goal of the current one is to add at least one another layer. We will continue to work with fully connected NNs.
The architecture you're supposed to build looks like the one on the image below.
As you may have noticed, we added here additional layer. If it's placed between the input and output, it's called hidden layer. Hidden layers are the components that make neural networks deep.