This was recorded back when the fluid and smoke simulator were separate, so those really are quite different nowadays. The cloth, soft body, and rigid body systems are almost exactly the same. The reason I haven’t done much with fluid physics recently is because it’s a bit of a buggy area in Blender (specifically parts of the smoke sim) and longstanding issues haven’t been addressed, so I don’t really feel like taking a couple months to make a new course about the topic. That said, there’s a lot of interest in fluid simulations still, so I do plan on making a course about liquids later this year.
