[albert_d]

A triad is simply 3 notes. (The major triad is the first, third and fifth notes of the scale). The three notes can be inverted like 3-5-1 or 5-3-1 or 3-1-5 or 5-1-3 (called first or second inversions depending on which note is the lowest) and get a different sound but they are still a triad. A triad can be played in more than one place on the neck. The minor triad has a flatted 3rd note. The Am triad would be A-C-E since the C# is flatted. I hope some of this helps.