Iron-based superconductors represent a second class of high-temperature superconductors after the copper oxides. Being in their second decade, they are all the more appreciated for the large variety of their chemical structures, diversity of magnetic ordering and the model character of their nematic phases. As with many unconventional superconductors, they exhibit an intricate connection between superconductivity and these other ordered phases. I will present an overview of the magnetism in several of these iron-based materials. I will also discuss some of the other surprising effects that arise from this close interaction of nematicity, magnetism and superconductivity. In particular, I will underline the role of the iron-based superconductors as model nematics that helped us shape new concepts and techniques to study such an unusual electronic phase in condensed matter.