  I review here the spatially-resolved spectroscopic properties of low-redshift
star-forming galaxies (and their retired counter-parts), using results from the
most recent Integral Field Spectroscopy galaxy surveys. First, I briefly
summarise the global spectroscopic properties of these galaxies, discussing the
main ionization processes, and the global relations described between the
star-formation rates, oxygen abundances, and average properties of their
stellar populations (age and metallicity) with the stellar mass. Second, I
present the local distribution of the ionizing processes, down to kiloparsec
scales, and I show how the global scaling relations found between integrated
parameters (like the star-formation main sequence, mass-metallicity relation
and Schmidt-Kennicutt law) present local/resolved counter-parts, with the
global ones being just integrated/average versions of the local ones. I discuss
the local/resolved star-formation and chemical enrichment histories and their
implication on the inside-out growth of galaxies. Third, I present the radial
distributions of the surface densities of the properties explored globally, and
how they depend on the integrated galaxy properties. Finally, I summarise all
these results and discuss what we have learned from them regarding the
evolution of galaxies. Final version in Journal Page:
https://www.annualreviews.org/doi/pdf/10.1146/annurev-astro-012120-013326
