chogath is one of the best characters in game he can play manny rolls like tank,jungler or ap . and he can go all lanes but now i focus chogath on ap off tank he is pretty good early if you are good whit his stun if you are not then just focus to get as manny assist or manny creep kill . if you want go mid use your silenc as much as you can then and stun is importatn in mid games to. and try to stun but dont get out of mana becus you need it somtimes and early game do your spells take much mana to use so be carfull and keep a eye on your mana. at lvl 6 you shuld get a bit ap so your feast do much damage and you need the stacks of your feast so use it as much you can to farm or take a kill but be sure you relly can kill alone.