Arguably there are just two categories: stuff and not-stuff (aka vacuum). And then you go from intergalactic space (almost entirely not-stuff) via interstellar space (marginally more stuff) through planets and stars up to neutron stars (lots of stuff) to black holes (well, we don't actually know what is inside a black hole exactly, our models break down).

Is this classification useful for everyday life? Not at all, but looking at things from different perspectives for a change can be quite amusing.

And to paraphrase Douglas Adams, the stuff is basically just a rounding error in the not-stuff. And insofar as there is stuff, it's all stars, with everything else being a rounding error. This is the case in our solar system, which, mass-wise is the Sun, with Jupiter as a rounding error - everything in the Solar System that isn't the Sun is mostly Jupiter.

https://en.wikipedia.org/wiki/List_of_Solar_System_objects_b...