I`d want to tell u how to with my Cho. I like to play solotop champs and cho is rly good on solotop.

Pros:______________________Cons:
+Easy to farm______________-In early dont have many mana
+Long silence______________-Low range of skills
+Many disables_____________-Easy to avoid rupture
+Good DMG
+Nice Tank

Story:
There is a place between dimensions, between worlds. To some it is known as the Outside, to others it is the Unknown. To those that truly know, however, it is called the Void. Despite its name, the Void is not an empty place, but rather the home of unspeakable things - horrors not meant for minds of men. Cho'Gath is a creature born of the Void, a thing whose true nature is so awful most will not speak its name. Its fellows have been poking at the walls that divide dimensions for a crack, a way into Runeterra, where they can visit their own personal paradise of horror upon the world. They are called the Voidborn, creatures so ancient and terrible that they have been removed from history altogether. It is rumored that the Voidborn command vast armies of unspeakable creatures on other worlds, that they were once driven from Runeterra by powerful magic lost to antiquity.

If such tales are true, then the rumors that follow must be equally true - that one day, the Voidborn will return. Even now, something dark stirs in Icathia, perverting the summoning rituals of the League to allow the presence of Cho'Gath. It is an alien creature of malice and violence, a thing that causes all but the most stalwart to cringe in fear. Cho'Gath even appears to feed on its predations, growing and swelling as it gorges itself. Worse yet, the creature is intelligent, perhaps greatly so, making most wonder how such a monster could be contained. Fortunately, the power of the League's summoning has confined Cho'Gath's presence exclusively to the League of Legends. It is here that summoners use Cho'Gath's Voidborn abilities to help decide the fate of Runeterra. The Terror of the Void knows what fate it would choose for Runeterra, given half the chance.

Woe betide the day when Cho'Gath grows weary of the League.

FLASH

Flash, on my opinion best summoner spell who helps all champs: MUST HAVE

TELEPORT

Teleport, is good summoner spell to help ur team, or teleport on base and return fast for dont losing turret.

IGNITE(EXHAUST)

Summoners spell to kill 1v1 on top.

CLEANCE

If enemy team so much silences\stuns\slow etc.
example: Kennen,morgana,sona,graves,gang plang(team) or smthing other. And if u scared of Long stuns, etc.

Early game:

Farm, farm, farm, u can go into agressive style ONLY IF U NEED TO COUNTER SOME CHAMPS. If u have low hp last hit creeps and u will be full, u are good laner, cause u have heal.
Mid game: U must buy wit`s end to deal many dmg and glaciar shrould to survive and cooldowns, when enemy back, push and go gank mid with jungler = easy kill, just rupture+silence and enemy died ;)
Late game: U must be in centre of teamfight - silence ap carry and kill ad carry, DEF URS CARRIES now focus what do u want, teamfight is won ;)

Jungler go to help u: GANK.
1. Start agring him! Silence + rupture. Then jungler stun\slow enemy, and your oponent die easily.
____1.1 Why silence first? Cause enemy can flash out yours rupture, and gank failed.
2ON2 SITUATION ON TOP U+JUNGLER VS SOLOTOP+JUNGLER.
1. Start focusing the squishy target first for faster kill, at start its usually jungler.
____1.1 Why no fat? Its just loosing time he can run easilly.
U GANK MID
1. Silence for no escapes mid, and rupture then, dps+eat = gg mid
HELP ON DRAGON\BARON
1.If they started taking Dragon\BARON just try to steal urs ultimate, then ocus the most damages target or targe near u(only if squishy). Try to focus AP, AD Carry, Then Support or jungler, or top.
TEAMFIGHT
Just repeat Dragon\Baron situation.

1st skill i take "q" for the save allie on buff or do damage on buff\enemy (and slow)
Then i take "e" for deal more damage on creeps or champ (if fast gank top).
I maxing "e" for max conmofrtable laninig, farming.
If u staying vs ap mage on top, max "w" for no escapes and damage on you.

Why "e" > "w" vs AD champ on top.

1.Silence is not beaty vs ad, he can kill u with autoattacks.
2."W" Burst damage, "e" DPS, with attack speed Dps>burst.
3.With "e" Easyier farming (good for newbies)

Rupture: U Must rupture behind enemy, and 90% u hit him!
Silence: Its normally just silence, lol.
Vorpal spikes: Turn it off if u dont want to push enemy. But i turn it on always for dmg enemy.
(tip)If enemy near creeps, turn it on and beat creeps, enemy must run to u to hit, u - no.
Ultimate: Eat creeps on line, 6 stacks and u have many extra hp, u can buy atma`s if u want.

U can use it, if u like ap cho` more than my.

U can use it, if u like ap cho` more than my.

If their team have low magic damage.

Enemy team have high ad damage

For extra damage, if enemy team have low damage (prefer for ap cho)

Good item when u take ults stucks on long time.

Cho, is tanky dps champ, who easy tanking all the teamfights, but not deal many damage as ap cho. In my opinion better helping team thenn deal damage.
Diffucult: Medium
Skills: Burst + hard dps
Ultimate: OP True damage + stacked gives many hp
Unganky: If u hit with q, u can run easy, if not better flash.