Learning all the triad positions on the guitar takes committment and is a lot of work. However, the effort will
pay its' self many times over. Here is an outline of one way to attack this.
1. Know all the note locations on the guitar
2. Know how to spell all the triads (you'll do 7th chords later)
You will need fretboard paper with 7 fretboard images on a page.
Do the following for each key, starting with the key of C.
1. On the first fretboard map, write the names of all the notes from a C major triad (C E G) at their fretboard
Then, use a pencil or colored pens to group the notes on the top 3 strings that comprise the triad. You will
find that each inversion of the triad can be found on each set of strings. For example, 3rd inversion (G C E),
root inversion (C E G), and 2nd inversion (E G C) all occur on the 1st set of strings.