Classical Yang-mills theory.- Path integral quantization of gauge theories.- Background field methods.- Instantons and ?-Vacua.- Schwinger model (QED)2.- Chiral anomaly in (QCD)2.- Fujikawa's path integral method.- Chiral anomaly in the Schwinger-Symanzik formalism.- Anomalous ward identities ¿a Wess-Zumino.- Topological aspects of the Wess-Zumino effective action.- Topological baryon number and the Skyrme model.- The Atiyah-Singer index theorem (for the Euclidean Dirac operator).- Chiral anomalies and differential geometry.- Effective gauge theory actions in (2n + 1) dimensions.- Chiral anomaly with gravitational background field.- Vacuum charge in 2n + 1 dimensions.