Hey guys my in game name is Atomichangman and this is my first guide so please don't hesitate to give me advice or tell me whats wrong about the guide. I'm not at a really high level of play but I'm pretty decent at the game. I made this guide to try to help others who are new to Jax, but i mainly made this guide to help my self. Please don't down vote before you try this and make sure to up vote if you like it (: HOPE I HELPED!!! (sorry if this is a lot to read its my first guide)

For the Marks i chose flat ad because you would want that early damage early game and once your level three you will be doing quite a bit of damage with your e, q and w spells.

For Seals i went with the flat armor because as you harass them early they might poke you back to and you might trigger minion aggro so its always good to have some early game armor.

For Glyphs i went with the flat magic resist runes because sometimes the person your fighting in your top lane might have a bit of magic damage for example Teemo, Rengar, Kayle and many more so its a good to have some magic resist around.

For the Quintessences i chose armor penetration just because you can do more damage and if he builds armor it wont affect you as much.

Boots and 3 pots: normal items to start game with, boots for some speed and pots for health if needed

Double dorans blade: gives you good sustain and with it you have some damage as you wait to finish your other builds

Rage Blade: Gives a nice amount of damage and ability power, and that unique passive is pretty good early game if you can get it fast with it you can wait till full stacks then jump on people and just beat them easily

Hextech Gunblade: another good hybrid item. It can be activated to deal damage and slow the selected enemy. Its good because once you slow him/her you might be able to take a few more hits which may trigger your ultimate

Trinity Force: This is a good item to pick up because you get so much out of it. Ad, AP, Crit, Move speed, mana, health, etc. Also its unique passive is good to have

Warmogs: Just for some health so you can jump in and wreck the squishes and not die due to being targeted.

Guardian Angel: In case you die due to a bad team fight or the enemy team targets you, you can be revived and keep your team from getting aced

Phantom Dancer: you can pick this or the rage blade if you like. This gives you more attack speed gives and a high critical chance with some movement speed.

Pro's

Strong laning phase

Easy to farm with

strong passive on your ultimate (deals 100/160/220 +70% of AP every 3 hits)

Does really well mid and late game

Con's

Weak early game

Long cool down on your e spell(dodge)

No crowd control.