It is difficult for me to coherently remember these concepts.. Things like Machine learning is already beyond me - PCA, KNN, regression, classification

Not forgetting reinforced learning with Q learning or policy learning, degrees of freedom.

Even in deep learning, there are so many model including GAN, CNN, and LSTM.

It is hard work.

Also, Neuron is quite a misnomer right, an actual human neuron doesn't really work in a way with such persistent linkage?