The beginner file features the basics of using blender such as how to navigate and common hotkeys, it also includes hotkeys, cameras, lighting, characters, and modifier examples.
Intermediate focuses on setting up simulations such as for hard and soft objects, and liquids.
Advanced digs further into the simulation systems to work with things like hard object rigging (using rigid body constraints.) For example how to make a crane with a wrecking ball on the end, that can actually swing and hit and take part in the simulation.Soft object simulation advanced topics including how to attach a flag to a flagpole or clothes to a person. Advanced liquid simulation topics such as color mixing and fast moving objects. This will primarily focus on the FLIP Fluids add on.