While the entire 2021 series is 70+ videos and 10.5 hours, the new 2021.5 features start here (about 15 videos, 2.5 hours):
Thick Skin, Contrast Brushes and Deformers, ZModeler Updates, Preview AO, Curves Helper, 3D Mouse Support and more, lots of neat features to try out in all sorts of ways! Here’s a few:
There’s been some amazing additions in ZBrush 2021, and like I said there’s been some really fun stuff added to 2021.5 - Happy ZBrushing and Happy Holidays!! 
