Guitar Harmony: Triads – Part 1
The first step to learn harmony on the guitar fretboard, is to learn the basic triad voicings. In this lesson, we’ll learn the root postion for the major, minor and diminished triads.
Starting on the C on the 6th string (8th fret), here are the voicings for C, Cm and Cdim:

Now let’s move up one string to play F. The shapes used are still the same.

Let’s try C again, only on the 4th string, 10th fret. Notice the shapes are a bit different now.

And finally, F starting on the 3rd string. The shapes are different her as well.

Practice these a bit to get used to them. In the next lesson we’ll put them to use.