I shall discuss the construction of dual descriptions of (0, 2) gauged linear sigma models. In some cases, the dual is a (0, 2) Landau-Ginzburg theory, while in other cases, it is a non-linear sigma model. The duality map defines an analogue of mirror symmetry for (0, 2) theories. Using the dual description, I shall discuss how to determine the instanton corrected chiral ring for some illustrative examples. This ring defines a (0, 2) generalization of the quantum cohomology ring of (2, 2) theories.