I believe you are mixing up empty space which does have quantum properties with nothingness -- the nonexistence of anything. Since no thing exists, there can be no properties of a thing. However, you mention "quantum leaps" or, more commonly, quantum jumps. Those occur, not in nothingness, but in space and I believe are an indication that space may quantized (discrete) rather than continuous. Another topic for another time, perhaps.
No, leptons and bosons do not combine to form quarks. The terms are descriptors of types of fundamental particles. There is no evidence that quarks are made up of smaller particles. They are considered to be fundamental particles.
I believe you are mixing up empty space which does have quantum properties with nothingness -- the nonexistence of anything. Since no thing exists, there can be no properties of a thing. However, you mention "quantum leaps" or, more commonly, quantum jumps. Those occur, not in nothingness, but in space and I believe are an indication that space may quantized (discrete) rather than continuous. Another topic for another time, perhaps.
No, leptons and bosons do not combine to form quarks. The terms are descriptors of types of fundamental particles. There is no evidence that quarks are made up of smaller particles. They are considered to be fundamental particles.
Yep for sure nothing exists in our universe.
Difficult to say if it's just a property or tiny (fill) or nothing is the see to everything else.
A quantum leap has 2 trains of thought.
The universe is quantised but the electron orbit flies in the face of that never loosing momentum, orbital energy and never allowed to be some part of an orbit.
Easier solution is orbit, nothing, orbit etc.
You can't change orbit or momentum or loose energy to nothing.
Even in the electron orbit it's not all electron in that orbit.
Most of the orbit is nothing and the leap properties forces it to be nothing.
leptons and and quarks you are correct that are the smallest particles.
bozons are another class.
3 quarks make a neutron or proton.
3 quarks never touch but are though to be bound with charges to form a proton.
Ever wonder what is between these smallest of things that never touch?
Fluctuation IMO isn't a property of the universe.
The universe/s is a product of fluctuation.
Fluctuation a product of either potential energy of nothing or instability of nothing.
Nothing as a math problem is a pretty easy one, nothing as a fundamental part or even creator of everything is a long trip of the mind for sure.