Galaxy evolution from hydrodynamical simulations: what have we learned about the physical processes governing galaxy evolution?

I discuss how hydrodynamical simulations enable exploring nonlinear couplings amongst different physical processes in galaxy formation. I focus on three topics: the effect of baryonic processes on dark matter halos, how stellar feedback leads to 'self-regulated' galaxy formation, and the interplay amongst stellar feedback, magnetic fields, and cosmic rays. Invited talk presented at the conference Galaxy Evolution Across Time, 12-16 June 2017, Paris, FranceThe Flatiron Institute is supported by the Simons Foundation