Bruce LEE is handy in a fight.
Swords are handy for cutting wheat.
to use (usually a body part) - 口を利く： have a smart mouth. 良く利く鼻: have a great nose, have wonderful smelling-ability. 目が利く: to have a discerning eye (for art/ antiques / etc.)
profit (both literal and figurative)
WHEAT is a handy snack, but
excessive mc's RIDING your jock is wack.