Below are 6 quark types and the charge of each.
Quarks also come in three colors: red, green, and blue. Antiquarks have the opposite color of their corresponding quark. The strong force, which is the force that binds quarks together within hadrons, is mediated by gluons, which are also colored particles. Gluons can change the color of quarks, which allows them to bind together.
So, one should know that Quarks have never been directly observed as free particles. This is because the strong force is so strong that it prevents quarks from existing on their own. The only way to observe quarks is to study the hadrons that they make up. This is known as quark confinement.