You may also want to consider reading through some of the important (or highly cited) academic papers in AI/ML/NN. From these papers you may get a sense of the

You may also want to consider reading through some of the important (or highly cited) academic papers in AI/ML/NN. From these papers you may get a sense of the techniques researchers are using, and which topics are most important to learn. I have not applied this technique to AI/ML/NN specifically, but it has been useful for me when trying to learn other topics.