Ok time for the scientist to shine
All of responses above do not account for light, which would be under "everything".
When accounting for light, it's not atoms or matter or quarks. Rather everything is made out of quantum fields. A quantum field is a uhh...
Imagine a shockwave surrounding all around an explosion - top and sides. The shock travels through the air which is the medium for the shockwave. The field would be the abstraction of the air medium, basically representing intensity all throughout the space it occupied. How bunched up the air molecules are is the intensity, and the shakewave is the result of extreme intensity.
Now quantum fields may or may not have an associated medium, fuck knows, and if does, that's like a bunch of shit stained can of worms in a balls deep rabbit hole nobody would want explore. But suffice to say they are a bit more than just intensity all throughout space. There is also direction. That is what allows light to be polarized. And there is also orientation. That is what allows left and right handed phenomena - ever heard of the right hand rule? Finally there is tension. That is what allows warping of space.
intensities -> scalars
directionalities -> vectors
orientations -> spinors
warping -> stress tensors
Altogether the fields contain various ripples that are the various particles.