In this 5-string banjo lesson, Hank Smith shows you how to build chord forms with extensions. He starts you with a regular G triad and demonstrates how to change this shape to make a G minor, G7, G minor 7th, and G minor 7th with a flatted 5th.
Learning how to build chord shapes on your own is an essential skill needed to construct all of the many types of chords forms. It also will greatly improve your knowledge of the banjo fingerboard, improve your understanding of harmony, and improve your ear.
Let us know if this lesson helps you and if you have any questions or things you would like demonstrated in the comments below. Good luck!