If you're not getting attacked very often, I don't see the need for combat training. If you're interested, though. Maybe look for someone from this world to spar with you.

[Gokudera only knows how to fight because of the need to do so. Growing up the way he did, it was very much a life or death and case-by-case sort of ordeal. You just figure it out? He's not sure how to explain it. Each opponent is different, so learning could be beneficial, but it's always easier to just literally and figuratively roll with the punches.]

Look out for yourself, then. See what happens. That's how most people learn how to fight.