(Totally not hijacking)
Aren't they all like really specific? So its easier to choose what you want to learn. For example, recent one I have watched is Shape Painting + How to study Better, but maybe you currently want to learn more about colors, you guessed it, go with that etc.
There is no best tutorials of his, since they all are specific, and informative. Or you could just grab his weekly discount that he has been doing recently.