As ap gragas i recommend to go mid, beacuse he can hold lanes very long and well becuase of hes pasive and Drunken rage. when u throw out ur barrel try to throw a bit behind them or a little at the side cause they probobly move back or at the side when u throw ur barrel. Drunken rage, i recommend to use everytime its not on cooldown. Becuse its gives u mana reg and more dmg so u can take down towers, other players and farm easyer. Body slam, Gragas charges to the place u mark him and dmg and slows (Dmg splits among units hits.)Explosive cask, knocks back the champions and dealing dmg to all who stands in the explosion.