What is the opportunity?: Interest in the guitar has had a healty rebound in recent years after seeing declining growth in the first years of the 21st century. Guitar sales saw record numbers in 2020 thanks to people looking for ways to fill time during the COVID pandemic. The growth has been seen in learning resources as well. Fender Play, an online guitar learning community created by the well-known guitar manufacturer, jumped from 150,000 to 930,000 subscribers in 2020.Who are we targeting?: Guitar Theory For Dummies provides a second step in the guitar learning process. The content assumes the reader has learned fundamentals like playing open and barre chords as well as how to play simple blues riffs. The focus in this book is on how music fundamentals like scales, keys, and chord voicings can be applied on the guitar.