Triads are a deep subject. I won't pretend to tell you everything you need to know about triads in a single guitar lesson. What I want to do is show you enough about triads - specifically Major, Minor, Diminished, and Augmented Triads - for you to then figure out how to use them in your own playing.
It is tough to talk about triad arpeggios without talking about triads as chords. So in this guitar lesson you will see exercises that might look more like triad chord exercises, but there is a logic here: because triads can be used in so many ways, I don't want this lesson to give you the impression that triads have to be played a certain way. In other guitar lessons I show how to play triads on two strings, how to play them with tapping. In this guitar lesson, you will see yet another way to look at triads, which might also give you some ideas for your rhythm playing since I show you useful triad chord shapes. Furthering one's mastery on the guitar really depends on seeing given concepts in several ways!
A lot of guitarists probably come to this site thinking they will learn about sweep picking. I will get to sweep picking in future lessons, but I believe it makes more sense to show sweep picking after one has already gained a deep enough understanding of arpeggios. I say this because sweep picking is just a technique. The technique itself doesn't tell you much about triads. So go through this lesson with the number one goal being to understand the nature of triads! Then when you get to my sweep picking lessons you will be far ahead of most guitarists who know only a small handful of sweep picking shapes because they didn't take the time to learn about the structure of triads which opens up many additional sweep picking shapes.
Ok, enough talking. Time to hit the lesson material!