Jax first ability is to jump next to a enemy and meke normal and magic damage. Jax's second ability will give Jax extra damage for next attack, dealing normal+magic damage. Jax third ability, when he dodges attack, he can attack all enemies around him and stunning them. fourth main abilitie has a passive and active, passive gives you extra attack speed after each hit (max stock 10) and active let you make extra damage in every third attack and enemys wont hit their normal damage to you.

Jax is always at close combat so he needs in defense amor and magic resistanse that enemy cannot deal that much damage and do it more difficult to make damage to you. In offense you only need ability power because you make your main damage whit spells in the first 10-12 level.

These are best items for Jax. Jax needs only damage, ability power, life steal and some attack speed. All Jax abilitys neads more than normal ability power, what will keep spells effectiv for entire game. Jax`s damage is important whit he`s abilitys makes it easy him to attack enemys and dealing lots of damage. Attack speed is not that important but it makes it easier to kill enemies and enemy champions.Life steal is important, whit Jax`s damage and 51% (prosent) and attack speed Jax can stay longer time fighting and making it more difficult to kill him. Dorans shield is sold first then guuinsos ragetable second this is in the end best item select in the game four Jax.