This book introduces advanced concepts and topics of solid-state theory to graduate-level students interested in advanced topics of condensed matter physics. It is self-contained in the sense that it provides the theoretical tools to calculate properties of interacting quantum systems (elements of many-particle physics), which are then applied to a selection of subjects of interest in condensed matter physics: dielectric theory of the solid, transport theory and superconductivity. Basic knowledge in the concepts of condensed matter theory as well as solid background in quantum mechanics is assumed.