How to draw in Procreate

How to draw in Procreate? Illustrator and animator Stefan de Groot explains in this video tutorial how you can draw in the drawing app Procreate on iPad.
Here are some samples of his work he did in this app:
StefanTekent-Procreate-PlatypusBaby

StefanTekent-Procreate-achtergrond-TasmanieRivier

StefanTekent-Procreate-Gavial