ZBrush - Revised Edition
I am studying ZBrush on my own, and I really like that the course explains everything step by step, from the smallest details to the bigger concepts.
When I have questions or run into problems while practicing alone, I ask through the inquiry board, and the replies are kind and fast, which is great.
When one topic is taught, the instructor gives good examples and explains how to apply it, which I really appreciate.
It was also nice to learn what was newly added in ZBrush 2019.
Personally, I had debated whether to take the previous ZBrush course or the 2019 course, and I think choosing the 2019 course was the better option!