  In this paper we review the basics of magneto-rotational properties of
neutron stars focusing on spin-up/spin-down behavior at different evolutionary
stages. The main goal is to provide equations for the spin frequency changes in
various regimes (radio pulsar, propeller, accretor, etc.). Since presently spin
behavior of neutron stars at all stages remains a subject of many
uncertainties, we review different suggestions made over the years in the
literature.
