  In these two lectures I review the basics of heavy-ion collisions at
relativistic energies and the physics we can do with them. I aim to cover the
basics on the kinematics and observables in heavy-ion collider experiments, the
basics on the phenomenology of the nuclear matter phase diagram, some of the
model building and simulations currently used in the heavy-ion physics
community and a selected list of amazing phenomenological discoveries and
predictions.
