Watch the A Major Diatonic Triads online guitar lesson by Joe Dalton from Fretboard Epiphanies
1st, 2nd, and 3rd Strings
The right hand pattern is different in that we pick notes simultaneously without the thumb this time. I think you’ll get a lot of mileage out of this pattern. Remember to practice all of these patterns slowly at first. Don’t give up on them if they seem difficult. Practicing each of these patterns is learning a new habit, It may take some time.