2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43975I present an overview of the standard model, concentrating on its global continuous symmetries, both exact and approximate. There are four lectures, dedicated to spacetime symmetry, flavor symmetry, custodial symmetry, and scale symmetry. Topics include Weyl, Majorana, and Dirac spinors; massive neutrinos; electroweak symmetry breaking; effective field theory; and the hierarchy problem.31 pages, 5 figures. Lectures presented at TASI 2004High Energy Physics - Phenomenologytext