  These lecture notes give an introduction to the algebraic renormalization of
the Standard Model. We start with the construction of the tree approximation
and give the classical action and its defining symmetries in functional form.
These are the Slavnov-Taylor identity, Ward identities of rigid symmetry and
the abelian local Ward identity. The abelian Ward identity ensures coupling of
the electromagnetic current in higher orders of perturbation theory, and is the
functional form of the Gell-Mann-Nishijima relation. In the second part of the
lectures we present in simple examples the basic properties of renormalized
perturbation theory: scheme dependence of counterterms and the quantum action
principle. Together with an algebraic characterization of the defining symmetry
transformations they are the ingredients for a scheme independent unique
construction of Green's functions to all orders of perturbation theory.
