Hello, I am SPYD3R and this is my Mid-lane Gragas guide.

Gragas is a special champion that when used correctly can dominate lane. Gragas has a destructive AoE combo that can clean up enemies or deal a lot of damage in team fights.

Pros

Gragas has a high-damage Q-R combo
Good poke
strong sustain
AoE slow and attack speed slow

Cons

Squishy early game
E is very punishing when used incorrectly
mostly of skill shots

While Gragas' attack damage is low, his AP is fairly high so using his Q to farm is very effective. This although can pick away at Gragas' mana. Poking during the laning phase gragas' can use his Q to farm and poke. Rolling barrels onto ally minions will keep any melee champ at bay bay while you farm. to pull of a poke combo gragas can W for damage reduction, use a Q to the enemie's location, E to stun, then hit Q once again for a lot of damage. this combo can be used to take health from the opposing laner or even to even out trades.