If there is one gift you could give your child, only one thing or trait you could leave them with, the most important is self-confidence. Self-confidence, mixed with the proper amount of humbleness (which is NOT the opposite) is the one thing from which all other skills and accompishments can come.
Unlike my father, who took (and still takes) every opportunity to belittle and diminish our self-worth, our feeling of ability and competence, I think that if I were lucky enough to ever become a dad I would make sure to instill a feeling of self-confidence in my child.
My child would feel able. I would also be sure my child knew they were loved. Unfortunately it's unlikely I'll ever be able to be a dad.