This is a build on how i like to play Jax, The Grandmaster At Arms. This might be a glass cannon build until the very late game, but if the game lasts that long you will be really strong. Make sure to have a tank on your team, as you wont have much HP before you 5th and 6th finished item

Take hybrid pen marks and quints, as they will make sure you are not as easily countered by armor and magic resist.

Armor seals and MR glyphs will make sure you take a bit less damage from auto attacks and spells

I use 30/0/0 on Jax, as I primarily go for damage and AP on him

This is the item build i normally use. Feel free to change any items as you might need more health if your team has no tanks or if you have really big tanks it might be enough with a glass cannon build, though i do recommend some armor and magic resist

Max your W by level 9, Q by level 13 and you E by level 18, and your R whenever it is available. When trading in your lane use E to avoid all auto attack damage, and jump to your opponent with Q. Spam W in trades, and use your ult when you are in big fights

Pros of this build is that you will be able to deal high damage, split push like a GOD! and solo Baron Nashor

Cons of this build is that you don't have much HP before late game, and you have a high cooldown on your E befoe late game

DO NOT JUNGLE WITH THIS BUILD! Jax is way better in top lane, especially with this build

If a team fight is about to break lose, do not be the one to engage it. Wait for a heavy engage from your teammates and jump in to pick up kills. stay close to your allies so you can jump to them with your Q if the fight goes bad

Every champion in the game is countered by someone. As Jax your biggest fear is often Renekton, so in draft pick or ranked make sure to check who is strong and weak against Jax, or any other champion you're playing