Constructing a Triad
The simplest form of any chord is a triad. A triad by definition is a set of three notes stacked vertically in thirds; in this example, we are talking about a major triad, which refers to the root, third, and fifth of the chord as seen in this diagram.
A Triad is created using a scale, and taking the 1st, 3rd, and 5th interval. The triad above is a C Major Triad, consisting of the intervals C, E, G. You can use this same formula with any major chord. For example, using the root note F, we can determine that the third is A, and the fifth is C. All you have to do afterwards, is find those notes on the fretboard and you have successfully created a triad.
Types of Triads
There are four types of triads: Major, Minor, Augmented, and Diminished Triads. For this part, we are going to use a Major Triad as a reference. So a Minor Triad is made up of the root, minor third, and fifth. In terms of a major triad, all we need to do is make the third of the chord flat.
https://mattwarnockguitar.com/triads/
Triad Inversions
Circle of fifths, Reading sheet music P2
Guitar: A Divergent Path 