Hey, Guys, this is my first EVER post on this website I have been a Jax main for a little bit now and learned from a diamond 3 player. I still have a lot to learn about this champ but I developed a few strategies that can become disgusting in the early to the late game
A bit about me is that I am a c9 fan. If anyone bothers to read these congrats you may just get to plat using this strat

This is the only chapter I'm willing to make cause I'm too lazy to write down the runes all the other things u need are up there, Anyway, in the beginning, get your buff near bot lane no matter what. You must do it as fast as possible WITHOUT USING SMITE save that for later than get your blue buff as fast as possible rush over to their buff that they haven't gotten yet (you know this by the missing bot lane or missing top lane) put a ward down now that you got your buffs. Go on ahead and take a few camps near their buff the second you see their icon on the map RUSH OVER THERE and stand right behind their buff in a bush when the buff is at 500 health jump in stun him smite the buff and kill him

[*] go kill your buffs FAST forget about the camps for now.
[*] go place a ward at the buff they didn't take yet.
[*] kill camps near the buff they didn't take yet (NOT THEIR CAMPS).
[*] Second you see their icon appear at their buff run over there and wait.
[*] when the buff is at 500 hp jump in smite the buff stun the enemy jg and kill him.