Build a chord and see where it falls on the neck
A major chord is the root, the major third and the perfect fifth: 1 3 5.
In the lessonTriads: stacking thirdsShape 1 of 5, open: from the open strings to fret 3. The root is at fret 3 on string 5 and at fret 1 on string 2. String 6 does not sound.
Showing the degree of each note.