Dynamical mechanisms are essential to exchange angular momentum in galaxies,
drive the gas to the center, and fuel the central super-massive black holes.
While at 100pc scale, the gas is sometimes stalled in nuclear rings, recent observations
reaching 10pc scale, or 60mas with ALMA, have revealed, within the sphere of influence
of the black hole, smoking gun evidence of fueling. Observations of AGN feedback
will be described, together with the suspected responsible mechanisms. Molecular
