Technically speaking, Ira is best at teaching Keyblade Wielding 101, but that can easily be expanded to basic swordplay and combat magic. He's also been developing his dreamotion abilities and will gladly pass on anything that he's figured out to anyone who needs it.

And well, he's a bit of a nerd who likes reading and learning so that can be added as well. He's not strictly a teacher, but he does his best.