I have been maining Jinx for just over a year and a half and would LOVE to help people learn to love carrying with Jinx as much as I do. This guide is aimed for people with beginner to intermediate skill levels with this wonderful champion. (Make sure to comment if you feel like more information could be added or if you have a question)

Jinx is a relatively simple champion to carry with because she is one of the strongest champions in late game. both due to your AOE crits and your bonus attack speed with Pow-Pow, the Minigun. Normally, your job as Jinx is to farm farm farm until you reach the state of hyper-carry.

+ Easy to carry with.
+ Mechanically simple.
+ Get Excited! is very strong
+ Fishbones, the Rocket Launcher's AOE crits leads to good team fights.
+ Super Mega Death Rocket! can help execute low health targets far away.

- No escapes.
- Low mobility without passive.
- Squishy (Duh!).
- Needs items to do any damage.
- Gameplay can be repetitive with so much farm.
- Super Mega Death Rocket! is easy to miss.

Runes for Jinx are pretty standard for ADC. Some people like building one Quintessence of Life Steal, but i believe that with Warlord's Bloodlust you have enough sustain in lane, and in late you have a Bloodthirster so life steal isn't a problem. You can also mix MR blues with Scaling MR blues for a little increase in stats late game.

Like most ADCs, 18-12-0 best suits Jinx, and you can choose between Warlord's Bloodlust and Fervor of Battle . Personally i prefer warlords bloodlust for the safer and more sustained early and early-mid game, however, i believe that late game, Fervor of Battle is the stronger option of the two. If you are new with Jinx or are against someone with a lot of poke, take Warlord's Bloodlust , but if you know you are playing with someone who you won't have a hard time beating, go for Fervor of Battle for the extra damage.
Battle Trance is really strong on Jinx, as it combines with the attack speed from Pow-Pow, the Minigun and the damage bonus from Fishbones, the Rocket Launcher. Secret Stash is a better option of the three, as you share lane with your supp, making Assassin useless , and don't usually have your jungler give you buffs, so Runic Affinity isn't the best option.

Flash is standard.
I take Heal since it is the summoner spell that suits ADCs best. All i have to say about this is don't be afraid to use Heal just to catch up to someone just out of range.

Skill maxing with Jinx is relatively straightforward, Switcheroo! first, for the extra damage and range, as well as more attack speed. Second you max Zap!, as it scaled with 140% of your AD, unlike you Flame Chompers! which you max last since it scales with AP. Max Super Mega Death Rocket! whenever you can.

Farming is core to play Jinx, as she is based on farming until you have the items you need to deal high amounts of damage to enemies in team fights. Runaan's Hurricane really helps with farming a lot in terms of speed, and a B. F. Sword before a Runaan's Hurricane will both increase you damage with rockets and help last hit with more ease. If you have trouble farming, i recommend going into a custom and trying to farm until 100-150cs every once in a while.

Farming Goals:

Since you are the ADC, it is only natural that the enemy will focus you because you are your team's main damage source. With Jinx fight with Fishbones, the Rocket Launcher if it is a teamfight, so as to deal heavy AOE damage. If you need a little bit more dueling power, the bonus attack speed from Pow-Pow, the Minigun really helps in skirmishes, as it stacks quickly. Remember that it is important to rock your passive and use it to its full potential, one kill/assist can lead to an easy teamfight.