Question: In general, how do leptons differ from quarks?
About the article "Electron", section "Classification".

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In the Standard Model of particle physics, electrons belong to the group of subatomic particles called leptons, which are believed to be fundamental or elementary particles.
Electrons have the lowest mass of any charged lepton (or electrically charged particle of any type) and belong to the first-generation of fundamental particles.
The second and third generation contain charged leptons, the muon and the tau, which are identical to the electron in charge, spin and interactions, but are more massive.
Leptons differ from the other basic constituent of matter, the quarks, by their lack of strong interaction.
All members of the lepton group are fermions, because they all have half-odd integer spin; the electron has spin .
There is an entire literature concerning the "structure of matter", ranging from the "electrical structure" in the early 20th century, to the more recent "quark structure of matter", introduced today with the remark: "Understanding the quark structure of matter has been one of the most important advances in contemporary physics."
In this connection, physicists speak of "matter fields", and speak of particles as "quantum excitations of a mode of the matter field".
And here is a quote from de Sabbata and Gasperini: "With the word "matter" we denote, in this context, the sources of the interactions, that is spinor fields (like quarks and leptons), which are believed to be the fundamental components of matter, or scalar fields, like the Higgs particles, which are used to introduced mass in a gauge theory (and that, however, could be composed of more fundamental fermion fields).
"The modern conception of matter has been refined many times in history, in light of the improvement in knowledge of just "what" the basic building blocks are, and in how they interact.
In the late 19th century with the discovery of the electron, and in the early 20th century, with the discovery of the atomic nucleus, and the birth of particle physics, matter was seen as made up of electrons, protons and neutrons interacting to form atoms.
Today, we know that even protons and neutrons are not indivisible, they can be divided into quarks, while electrons are part of a particle family called leptons.
Both quarks and leptons are elementary particles, and are currently seen as being the fundamental constituents of matter.
These quarks and leptons interact through four fundamental forces: gravity, electromagnetism, weak interactions, and strong interactions.
The Standard Model of particle physics is currently the best explanation for all of physics, but despite decades of efforts, gravity cannot yet be accounted for at the quantum level; it is only described by classical physics (see quantum gravity and graviton).
Interactions between quarks and leptons are the result of an exchange of force-carrying particles (such as photons) between quarks and leptons.
The force-carrying particles are not themselves building blocks.
As one consequence, mass and energy (which cannot be created or destroyed) cannot always be related to matter (which can be created out of non-matter particles such as photons, or even out of pure energy, such as kinetic energy).
Force carriers are usually not considered matter: the carriers of the electric force (photons) possess energy (see Planck relation) and the carriers of the weak force (W and Z bosons) are massive, but neither are considered matter either.
However, while these particles are not considered matter, they do contribute to the total mass of atoms, subatomic particles, and all systems that contain them. 
The Standard Model is the theoretical framework describing all the currently known elementary particles, as well as the Higgs boson.
This model contains six flavors of quarks (), named up (), down (), strange (), charm (), bottom (), and top ().
Antiparticles of quarks are called "antiquarks", and are denoted by a bar over the symbol for the corresponding quark, such as for an up antiquark.
As with antimatter in general, antiquarks have the same mass, mean lifetime, and spin as their respective quarks, but the electric charge and other charges have the opposite sign.
Quarks are spin- particles, implying that they are fermions according to the spin-statistics theorem.
They are subject to the Pauli exclusion principle, which states that no two identical fermions can simultaneously occupy the same quantum state.
This is in contrast to bosons (particles with integer spin), any number of which can be in the same state.
Unlike leptons, quarks possess color charge, which causes them to engage in the strong interaction.
The resulting attraction between different quarks causes the formation of composite particles known as "hadrons" (see "Strong interaction and color charge" below).
The quarks which determine the quantum numbers of hadrons are called "valence quarks"; apart from these, any hadron may contain an indefinite number of virtual (or "sea") quarks, antiquarks, and gluons which do not influence its quantum numbers.
There are two families of hadrons: baryons, with three valence quarks, and mesons, with a valence quark and an antiquark.
The most common baryons are the proton and the neutron, the building blocks of the atomic nucleus.
A great number of hadrons are known (see list of baryons and list of mesons), most of them differentiated by their quark content and the properties these constituent quarks confer.
The existence of "exotic" hadrons with more valence quarks, such as tetraquarks () and pentaquarks (), has been conjectured but not proven.
</ref>Elementary fermions are grouped into three generations, each comprising two leptons and two quarks.
The first generation includes up and down quarks, the second strange and charm quarks, and the third bottom and top quarks.
All searches for a fourth generation of quarks and other elementary fermions have failed,</ref> and there is strong indirect evidence that no more than three generations exist.</ref> Particles in higher generations generally have greater mass and less stability, causing them to decay into lower-generation particles by means of weak interactions.
Only first-generation (up and down) quarks occur commonly in nature.
Heavier quarks can only be created in high-energy collisions (such as in those involving cosmic rays), and decay quickly; however, they are thought to have been present during the first fractions of a second after the Big Bang, when the universe was in an extremely hot and dense phase (the quark epoch).
Studies of heavier quarks are conducted in artificially created conditions, such as in particle accelerators.
Having electric charge, mass, color charge, and flavor, quarks are the only known elementary particles that engage in all four fundamental interactions of contemporary physics: electromagnetism, gravitation, strong interaction, and weak interaction.
Gravitation is too weak to be relevant to individual particle interactions except at extremes of energy (Planck energy) and distance scales (Planck distance).
However, since no successful quantum theory of gravity exists, gravitation is not described by the Standard Model.
See the table of properties below for a more complete overview of the six quark flavors' properties. 
Quarks & Leptons is the first EP by Oxide & Neutrino, released on December 15, 2013.
It's the followup to their third album, "2nd Chance", released in 2007. 
Leptons are particles of spin-, meaning that they are fermions.
They carry an electric charge of −1 e (charged leptons) or 0 e (neutrinos).
Unlike quarks, leptons do not carry colour charge, meaning that they do not experience the strong interaction.
Leptons also undergo radioactive decay, meaning that they are subject to the weak interaction.
Leptons are massive particles, therefore are subject to gravity.