Here are some resources that may be helpful to you or your students
Houdini Insight: (annotated files, curriculum, demos and resources for students)
Houdini Curriculum-in-a-Box: collection of ready-made lesson plans and related materials for teachers introducing students to Houdini for the first time
Instructor Discussion Video about teaching Houdini: Overcoming Obstacles to Teaching and Learning Houdini
SideFX Internal: Digital Library: (a variety of webinars, workshops and tutorials)
External Sites: Entagma CG Wiki Hipflask Houdini Engine CGItrainer [en français] Learning Houdini TikTok [en español]
Community: SideFX Forum Houdini - 3D Animation and VFX [Linkedin Group] SideFX Houdini User Group (HUG) [35 countries, 60+ groups)