Cho'Gath (Will be called Cho from here on) is a Tanky DPS champion, with strong disruption and tanking abilities. Cho is the biggest champion in the league at lvl 16 with full 6 stacks. Cho has a slightly weak early game, but he picks up and scales well into late game.

Passive: Carnivore- Whenever Cho'Gath kills a unit, he recovers 34 - 68 (+2.5 each level) health and 3.5-7.75 mana (+0.25 each level).
This passive is very nice as it provides you sustain for both your mana and your health, like a mini catalyst every time you last hit.

Q: Rupture- Ruptures the ground at target location. After a short delay, enemies are launched into the air for 1 second, dealt 80 / 135 / 190 / 245 / 305 (+100% of ability power) magic damage, and have their movement speed slowed by 60% for 3 seconds. Cooldown 10 seconds. Cost 80 / 90 / 100 / 110 / 120 mana. Range 950.
This skill is an AoE knockup after a delay, It is useful in teamfights where everyone is clustered together. The CD is decently long, but you will typically get 2-3 of these in in a teamfight.

W: Feral Scream- Cho'Gath screams in a cone in front of him, silencing enemies for 2 / 2.25 / 2.5 / 2.75 / 3 seconds and causing 75 / 125 / 175 / 225 / 275 (+70% of ability power) magic damage. Cooldown 16 seconds. Cost 70 / 80 / 90 / 100 / 110 mana. Range 300.
Quick, Nice Damage, and A 3 SECOND SILENCE! QUIEEEEETTTTTTTTT! This skill is nice as it has no delay after cast, does nice damage, and applys the 3 second silence to everyone it hits. A 3 second silence on the enemy team can win a fight for your team easily.

E: Vorpal Spikes- Toggle: Cho'gath's physical attacks launch spikes which deal 20 / 35 / 50 / 65 / 80 (+30% of ability power) magic damage to a line in front of him. Range 40.
This ability is essential if you are playing attack speed cho. It is like your Hiten Style or Righteous Fury. On Tanky Ap cho maxing this skill is not as important as the damage will mostly be coming from the ratio and your other skills.

R: Feast- Deals 300 / 475 / 650 (+70% of ability power) damage to target champion, or 1000 damage to target minion (ignores resists). If the target is killed by Feast, Cho'Gath grows, gaining 90 / 120 / 150 maximum health (maximum 6 stacks). Cho'Gath loses up to half (rounded up) stacks upon death. Cooldown 60 seconds. Cost 100 mana. Range 100.
True damage with a nice scaling. This skill is the most important tool to mastering Cho. Your ultimate does 1k true damage to minions, which allows you to beat any jungler's smite with this spell; The skill has a .7 AP RATIO, making you do tons of damage if you get some AP; and This skill gives you free stats for last hitting with it (Up to 6 times). End game if you have this stacked you gain 900 hp (As well as being really big)!
Note: You gain more size / stack every time you level the skill. At lvl 16 Cho will be at his biggest with 6 stacks.

Skill Order:

Tanky Ap cho, You will be tanky, and you will deal alot of damage with your feast.

Atk speed cho, with a wits end you deal alot of damage and are tanky from your ult.
Combos:

Q-W-(R when you want to kill, or for alot of damage if you have 6 stacks)

Yorick (Sustain off his ghouls, use them as a snack if needed), Malphite (Both are tanky, you can do an AoE knockup multiple times in a fight though, while he only has his to initiate.), Jax (Farm to 6, you will get very tanky. Your ultimate can kill him in his), Fizz (Ignore and farm), and Galio (Both farm all day long).

Vayne (Wont touch her, and she will scale hard into late game), Olaf (He will spam true damage), Warwick (To tanky/sustainy to kill), Rumble (Hes a bully), Teemo (Pokes you all day), Lee Sin (To much mobility and sustain) and Irelia (You cant stop her from becoming a monster).

• Balance out your harass with your passive so you do not run out of mana.
• If you hit a squishy with your Q, you may be able to flash R-W for a quick kill.
• Do not try and kill enemies in one go, wear them out over time then go in for the kill with your ultimate.

• Do not underestimate Cho's burst with his feast spell.
• Cho may be big but do not focus him.
• Cho has long CDs, if he blows them in lane commit on him for a fight and do some damage.

AP tanky

Rod of Ages- Tanky, mana, and Ap.

Rabadon's Deathcap- Makes your ult do alot of damage

Abyssal Mask- Gives you MR and Ap

Frozen Heart- Gives you CDR, armor, and mana.

Randuin's Omen- Tanky, lets you kill enemy ADs

Shurelya's Battlesong- Gives your team mobility in fights.

Deathfire Grasp- Gives you a burst.

Atk speed

Atma's Impaler- Gets you free AD on autos and some armor

Madred's Bloodrazer- Atk speed, good vs tanky teams.

Ionic Spark- Makes you push better, and do more AoE damage.

Malady- Lowers resistances, more AS, more magic damage on every hit.

Wit's End- More damage on hits, MR, and atk speed.

Nashor's Tooth- Ap, CDR, and Atk Speed.

Black Cleaver-More Damage on your attacks, and you help your AD carry.

Frozen Mallet- Allows you to stick to a target.

Cho is decent in soloQ as if he wins his lane he can be a pretty big factor in the late game.

Cho is good for a ranked team that is running a CC/Quick burst comp. He can silence the enemy team making them helpless for 3 seconds while your comp does its magic.

This was my top facts cho. Cho is a strong champion that has not been seeing as much play recently as he deserves. I hope this helped some of you get insight on cho, and will make you want to play him. As always have a good day and good luck on the fields of justice!

SERIES UPDATE:
I plan on releasing these every day/other day until I get all of the top lane picks in the league ( about 50-60 of them) if there are any requests leave in the comments below and ill work on them. I want to make this series for others to better understand the champions of top lane. Once I am done (Or once I have a few top facts out) I will release some Facts about top lane mechanics, eventually I will probably put everything into one generic top lane guide, however until I do that I will continue to watch and update my blogs as needed. Tips and tricks I missed under my Top Facts would be helpful if you put anything I don't have in the comments I will be sure to add it. I will be forming a guide called The complete guide to Top lane or something in that nature. The intention of this series is not as a "Build guide" or a "play guide", these are more like facts you should know about the champion. These are to inspire people to think of new champion possibilities they might not have thought of or to help a new player with the champion. I do not list runes masteries or a set build ( I give a kind of recommended items) in here due to the fact I want people to think of that for themselves and try new things. This series is an attempt for the LOL community to try new things and have fun in a fun game. Thank you for reading and have a nice day :P