Ringo obviosly is a Carry. I have seen some jungle Ringo's but they won't work out because there are so many expensive items Ringo has to get and the jungle doesn't supply you with gold as much as the lane does. Ringo wouldn't work out for Captain position aswell. He is squshy and doesn't have much mobility and the only helpful thing might be his A ability, he can slow down people, that's it. Hope you enjoy my explanation about Ringo.

Almost at all times you have to be aggressive with Ringo. But There are times where you have to be passive (for example, against the hero Saw or the enemy team has early adventage). Ringo is one of the easiest heroes to play but it takes skill to be making plays and staying on a killstreak. It's easy to kill lane minions and get good farm with Ringo. You have to be aggressive but very careful with Ringo, because it's easy to pick up a low health Ringo. One of the best things you can do with Ringo is kiting. Kiting is an action where you walk or run away from someone while hitting them and if you are skilled enough you'll kill them.

Build's with Ringo are usually the same but the players are different. You can see my Ringo builds that I made, which I think are the best.
Weapon Build: I use this build almost every game. Sorrowblade is for that plain weapon damage obviously. Breaking point is so good for Ringo if the enemy team has a tanky team (Example: Gwen(Lane), Phinn(Captain), Krul(Jungler).), you build stacks off of the tanks and the fight won't last for long because you'll have all of that extra damage. Tyrant Monocle's are there for the crits, since you have 2, you have 80% chance to hit a crit, so, in a fight you'll hit 8 crit shots from 10 shots you take. There is another Weapon build that I like. It's full crit build - Sorrowblade, Tornado Trigger, 2 Tyrant Monocle's, Aegis, Boots(Your choice). This build is great if the enemy team is squishy and you don't really have a tank from which to build off Breaking Point stacks.
Crystal Build: Crystal build is great if the enemy team is squishy. Shatterglass is for the huge damage. Broken Myth for shield pierce and stacks. Echo is used for echoing your Ult, which you can use again and the enemy team won't be able to block. Alternating Current for the attack speed.