Preprocessing: Shouldn't we shuffle before balancing?

Hi Lucia,
This is a great observation! In fact, this is the proper way to do it. It is great that you notice such things (it means you are truly understanding modeling).
We don't spend a lecture on that, but rather give it as an exercise for homework (exactly the next lecture: https://learn.365datascience.com/courses/deep-learning-with-tensorflow-2-0/preprocessing-the-data)
Best,
Iliya