Cho'Gath Counter Tips
Cho'Gath will always initiate a battle by casting his Q(Rapture), pick a mobile champion that can avoid his Rapture and get an easy lane.
Most of the Cho'Gath players will use R(Feast) on CS early 6+ levels. If you notice he have used it thats a perfect time to engage since he will have his ulty on cooldown.
Stacking HP will make his ultimate do much less true damage to you.