VFX school Rebelway has published a long free video tutorial on Houdini basics. The video is 5 hours long and shows what Houdini's built-in tools are capable of and how to tweak them to serve your needs.
The tutorial covers almost all of the major aspects and features of Houdini and a wide range of different effects at a manageable complexity level. The creators promise that it will teach you to use Houdini in a variety of ways without being overwhelmed by too much information.
The video is meant for those new to Houdini and who wish to enhance their understanding of the fundamental principles that Houdini is built upon to improve their more advanced work.
