https://www.sidefx.com/tutorials/pragmatic-vex-volume-1/

Pragmatic VEX is a highly planned, highly edited series aimed to increase the technical capacity of the artists and TDs. This series will enable you to tackle more complex production shots with complete control and ease by acquiring a deeper technical understanding of how things work in Houdini at the lowest level with a strong applied focus on high-end feature film visual effects production.