The order basically follows a studio workflow.
Mesh Modeling / Sculpting > Materials and shading / Texturing > Lighting > Rigging > Animation
Although rigging in a studio can generally be started earlier, whilst materials are being developed, for the purpose of learning the flow this is the best order.
Modifiers as Dwayne said is a newer course and added to the list, It covers most modifiers in Blender, some you won’t of used (and may never use) during the bundle.
However, modifiers are a fundamental part of most of what you will do in Blender.
