The best guitar arpeggios to learn first are the major triad (1, 3, 5) and the minor triad (1, b3, 5). The major and minor triads are the most common and most used guitar arpeggios in all of music.
What arpeggios should I learn?
Triads. Major and minor – these are essential arpeggios that are used at least some of the time in many styles of music, including pop, rock, blues, jazz and neoclassical. Diminished, augmented and sus chords – these should be viewed as optional by most guitarists.