https://www.schoolism.com/lp/introduction-to-zbrush-justin-goby-fields/

3D programs like ZBrush can seem daunting when you don’t have the right instructor. This class is perfect for those that might be intimidated when looking at the vast interface of ZBrush because Justin Goby Fields doesn’t just teach you how to use the program but he teaches his own techniques of how he uses ZBrush for his illustrations. Integrating ZBrush into your workflow can dramatically speed up your process.