Yes, TensorFlow is pretty “deep waters” and we’re just being introduced to it here. As Tom says, you don’t need deep knowledge of it, but you do need to find your way around things. One good resource is this thread on the forums, which gives a much more thorough explanation of how the Keras Sequential and Functional APIs work. There is also a lot of higher level documentation on the TF website, for example here’s an article by Francois Chollet about Transfer Learning that explains in more detail a lot of the ideas we are working with in the MobilNet assignment.