2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/101257This paper is an elementary introduction to the theory of moduli spaces of curves and maps. As an application to enumerative geometry, we show how to count the number of bitangent lines to a projective plane curve of degree $d$ by doing intersection theory on moduli spaces.expository- soft introduction to working with moduli. Many pictures. To appear on Expositiones MathematicaeAlgebraic GeometryGeneral Mathematics14n35text