My child is off the college. In the past, their mom has paid for our children's tuition using her own travel points cards. I'd like to use the future tuition payments as a teaching opportunity for our child to use their own credit card, and earn cash back instead. Aside from Discover, what cards would you recommend (fee-free, naturally) for a young adult to adopt for paying their bills? Travel rewards are NOT what I'm seeking here. Thanks!