Zbrush
Getting Started with Sculpting - ZBrush for Beginners Tutorial https://www.youtube.com/watch?v=_yKGfcp2z3k
Learn to Sculpt Like a Pro in ZBrush https://www.youtube.com/watch?v=0PaYUUvgwYM
Zbrush for Beginners Tutorial - Essentials to get Started with Sculpting HD https://www.youtube.com/watch?v=PO--0h8XHiw