To become an accomplished guitar player it is essential to acquire some knowledge of chord theory. This tutorial aims at giving the reader a sound foundation in chord building theory starting from scratch. The book consists of two major parts: the triadic and the seventh chord theory. It contains step by step constructions of the most popular scales and their harmonization. The book also lists the fretboard notation of a complete set of chords in the key of C which serves as an example for the construction of similar sets in all other keys. Examples are written in classical, tablature, and/or fretboard notation.