Shady Grove Chord Help

Hey, guys!

I was just learning how to play Shady Grove from Kyle’s video, and the basic melody, I’ve got down, but the chords are confusing me.

It starts off with all three strings strumming, but then Kyle seems to move to Ichi no ito, then to ni and san no ito strumming? I’m super new to music, and I don’t know if there was something I missed? Some tablature for the chords, or maybe some step-by-step instructions would be very helpful.