These triad lessons have such great application in group play. I play in different ensembles where it is important to look around and find where other people are playing their guitars to find a place where they are not. Triads are a terrific way to find a voice in the mix when coupled with the appropriate space and rhythm of the song. Arpeggiating , playing only on the snare 2 and 4 , sliding into the triad position , finger plucking etc, all can add unique character to the song when others are playing bigger or open chords. I seldom play more than 4 note chords in these groups and sometimes even condense down to a 3rd ( or minor 3rd) and a 7th dyad just to be present somewhere in a quieter tune. Important stuff to learn for group play. The easiest way for me to learn them was to just break down the bigger chords into smaller pieces, and as Steve said, know the roots. Great lessons here from Steve!