Here is some material we think would be helpful for this week's class.
A Friendly Introduction to Convolutional Neural Networks
A nice video going over a gentle introduction of CNN's and how they work is available on YouTube here.
Beginner's Guide to Understanding Convolutional Neural Networks
An easy to understand introduction here.
A more math oriented explanation of how convolutions work and why they work can be found here.
Review Keras for Written Digit Classification
A notebook going over how to build a model in Keras to recognize hand written digits is here.