Lecture notes on Calogero-Moser spaces, Hamiltonian reduction along an orbit, the Calogero-Moser space, the Calogero-Moser integrable system, proof of Wilson’s theorem, the Gan-Ginzburg theorem, the space Mc for Sn and the Calogero-Moser space, the Hilbert scheme Hilbn(C2) and the Calogero-Moser space, and the cohomology of Cn.