Jax is a very op hero consider him ap/dps/tank, he is very good in 1on1

There's only two jax( Pro player jax own suck player jax lose)

So you will only AIM WIN!

Ok i played jax for 5 days maybe. I'll use this to tell something i know, first well jax is very good in killing heroes and farm very well in jungle. Never ever be like a hero go alone to vs 3 above player you will die for sure. if you got gang by 4 people there are two way to escape 1st run to somewhere you can use your skill Q to run or spam E your will keep stunning them and run(survived rate 75%). Teamwork for Jax is very impotent too. Save your Q to run because you may get gank and have no skill to escape when your still in low level take note of that

I buy cloth armor with 3 potions for the start after you earn some golds get a ninja tabi it will help in your skill E(Counter Strike) if your out of potion get 3 more if you want too. I will firstly get gunisoo's rageblade this will help you increase your attack speed and easier to kill hero and i get sheen after gunisoo's ragebalde to increase my mana and at late games make it to Lich bane. Remember you can get potion all the times after item purchase it help you a lot. When you get a Hextech revolver you can go and solo dragon to farm yourself because of the item spell vamp. After all this you can are ready to get item that are good in helping you in battle!

I choose Flash and Exhaust

Flash: In battle your Q maybe be in cool-down and to make you survived it better to use flash to escaped it will be a great help

Exhaust: This skill can help you in two situations, The first one is that when you are battling someone and the hero is trying to escaped and because jax has no slowing skill and the skill E depends on hero or creep to hit you to active Exhaust is the best to use it on and lastly is to escaped when your running and someone slow you, you can use this skill to help you in escaped

I choose this runes is because it helps jax a lot in combat and farming well i do not really need to explain much :)

I play jax at the middle if your not good in middle then you should just stick to top or bottom

Mostly i teach you guys on middle if you want to try it. This is what i have experience, i always kill hero at the middle because well jax is a good 1vs1 hero and as you know this is the tricks that how i kill those hero. I try to weak the hero health point first using Q skill this what you have to remember using Q on the enemy and quickly run back to where your creeps is to prevent attacks by range or skills. if got your skill W, use the same mattered but use W first. One more thing this is like combo hero let enemy creeps hit you to get counter strike activate it and use W,Q,E and hit. It very good combo for jax and it deal a lot of damage maybe get a kill