This document discusses principles of cavity preparation and tooth preparation for composite restorations. It covers initial clinical procedures like local anesthesia and cleaning the operating site. It also discusses shade selection and different shade guides. The main part of the document focuses on cavity preparation principles like external outline form, retention features, and advantages of beveling. It describes different cavity designs for composite like conventional, beveled conventional, modified, box shape, and facial/lingual slot. It also briefly discusses isolation of the operating site, pulp protection, and matrix placement.