General aspects of perturbative quantum field theory (QFT). Example of cross section computation. Generating functionals in QFT. Action of Chern-Simons for abelian and non-abelian theories. General covariance, BRS gauge fixing, derivation of the Feynman propagator, Gauss linking number, gauge invariance, Wess-Zumino term. Basic definitions of knot theory, link poynomials, framed links. Gauge variables, holonomy, Wilson line operators. CS expectation values of holonomies associated with links. Skein relation, abelian and non-abelian link invariants obtained in the CS theory.   Surgery on 3-manifolds.