The goal of this course is to improve your understanding of 3D space so that you can imagine how objects (be they living or not) are placed in this space. Up to this point and going forward this will help with your understanding of perspective and you'll find that the upcoming lesson material on plants and everyday objects/animals/vehicles will help with fleshing out environments.

This course is a lot more focused on the technical side of how to draw these objects and not as much on the stylistic, design, or composition side of drawing. All of that being said, like the name "fundamentals" suggests, these skills are fundamental to everything. In the future you may decide to pursue how to flesh out a style of your own and to better your understanding of design and composition, but if you tried to tackle those subjects without the ability to sell the illusion of those objects existing in a 3D space then the first thing people will notice is how flat everything feels.

There are times where people intentionally make things look 2D (cartoons for example) but the reason they can do so consistently and successfully is that they made the choice to do so after understanding how the space they're utilizing works. (Abstract art is kind of an exception but even then you can usually tell between someone who knows what they're doing and someone who is just... doing something)

Long story short, yes I believe that continuing to develop the fundamentals here will help you in the future just as I've seen it help others before you.

I would also recommend going through the explanations/videos on the first page of Lesson 0 as it goes over some of these topics as well.

Hope that clarifies things.