How many types of fundamental forces are represented in the Standard Model of particle physics and which gauge bosons mediate each of these forces?

What the Standard Model's particle content is — 6 quarks, 6 leptons, 4 gauge bosons, 1 Higgs

Standard Model: 24 fundamental particles (6 quarks, 6 leptons, 4 gauge bosons, 1 Higgs)

Which gauge symmetry underlies the unification of the electromagnetic, weak, and strong forces at high energies, and how does it manifest in the Standard Model?

SU(2)xSU(3) gauge symmetry unifies forces in the Standard Model, manifesting as weak and strong interactions

What QCD (quantum chromodynamics) describes — the strong force between quarks mediated by gluons

QCD describes the strong force interactions between quarks via gluon exchange

What gauge symmetry is — local phase transformations that leave physics invariant, the basis of all fundamental forces

Gauge symmetry: Local phase transformations preserving physics, underlying fundamental forces

What the Higgs field does — permeates all space, gives mass to fundamental particles through coupling

The Higgs field permeates space, endowing particles with mass via interaction

Which Feynman diagrams represent the visual shorthand for terms in non-abelian gauge theory calculations in the context of quantum chromodynamics (QCD)?

Feynman diagrams for non-abelian gauge theory: gluon lines with self-interactions