The topics of this textbook are curves in differential geometry and they are studied by means of parametrization. Particularly; curvilinear coordinates, plane curves and skew curves like; helices, involutes, evolutes, spherical indicatrix, circles and spheres of curvatures. It also introduces some quadratic surfaces, theory of contacts, curves-surfaces contacts relationships, envelops, and the geometry of curves in differential geometry in general. The main properties of these objects, which will be studied, are notions related to the shape; specifically; tangents, principle normals,...