If you are just starting with ML a very good start IMO is "Deep learning with Python", by Chollet. The second edition is very recent. It starts from the basics

If you are just starting with ML a very good start IMO is "Deep learning with Python", by Chollet. The second edition is very recent. It starts from the basics and takes you to some complex scenarios. It's focused primarily on Keras, which is a very to use library to start from. The book covers a lot ML on images, so moving from there to generative art should be "easy" once you grasp the fundamentals. I don't know however how feasible is to do ML on Macs, it might be a breeze or impossible, I genuinely have no idea :-)