Meta

During the laning phase your main objective as Ahri isn't to bully the enemy laner.Remember you're not a lane bully.Your main objective is to have lane prio.Until you reach lvl 6,keep the wave on your part of the tower and push only when you have enough vision to do so,Ahri can die easily on ganks without her ultimate.After lvl 6,your main objective is the map not the lane.Push as much as you can as Ahri have a minion wave breakpoint on lvl 6-7 depending on which items you get first where her Q one shots the casters.Push the wave into the enemy tower and then ward (most of time you'll want to pink ward bot bush) the bushes to set up for either trapping,either roaming depending on the occasion.

Your main objective as Ahri is to assassinate the backline quickly and then get out to safety with your ultimate.After acquiring Lich Bane as second item,your damage potential increased drastically being able to take 80% of hp from the squishy champions.You'll want to take Rabadon or Shadowflame as third item,depending on the situation if the team has MR or too many bruisers,an occasional item that can be your third item could be either Zhonya (best working against Mel and Fizz) or Cosmic Drive if the team comp is formed mainly from tanks and bruisers than Ahri's kill threat threshold minimises and you'll want speed and haste for that matter as much as hp aswell.On the objective fights,Ahri isn't very good at dealing damage to dragon or baron,her main objective is keeping or stalling the enemy team from reaching the objective.Doing so a sweeper is necessary so you can trap the bush you know they're gonna commit to come and burst them right away,disengaging until the next rotation is available.

On the late game Ahri is no longer the assassin she could've been during early and mid game as she stops scaling after she is full build.Ahri's main role during late game is to trap the bushes,taking control over the map and bursting the champions while disengaging.She should be on the side lanes most of time to push the lane where her team is preparing to commit for an objective.During teamfights,you need to look and target their most valuable player from the team (most of time is their mid laner or ADC) and catch them with your charm so your team can engage.You will be the main peel for your team with your charm,your E can and will turn the teamfights into your favour if used right.Don't focus tanks and bruisers,focus on the damage dealers as always,on their backline while your team is focusing the frontline,that is your main objective.

Ahri isn't a melee champion,don't use you ultimate to engage in melee combat against melee champions,you'll lose.
Flash+E in the same time will catch most of time unsuspecting enemy champions and give you an edge to kill them.Most of time you'll want to use this combo only when they are on death threat threshold.
E+R is another tricky combo that will mask your E as you dash into the enemy laner.Although hard to master as you need to predict where the enemy laner will be so you can land it,because if you don't land it,it's gonna be a hard losing trade.It's a high risk high reward trick
Casting your W while out of range of minions and then approaching,your foxfire will always target the secured kill first even if they are 1hp.