Hi! I'm Ben, one of the instructors here. You can learn just as well on a left-handed guitar. I would even say it might be easier to look at a mirrored image of the guitar.

I know when I started out, I learned A LOT from watching Jimi Hendrix videos, and since he played left-handed, it was like looking at the guitar in the mirror (I'm right-handed). I actually found that easier than watching right-handed guitar players.

/Ben