Hi I'm Zany123321. This is a pretty short guide on Ahri that introduces two ways of playing her. Keep in mind that this is still a work in progress tho.

I chose some generic runes but you can also go for other choices. Such as Magic pen Marks, Magic resist Glyphs ... Overall the runes you chose depend on how well you know the champion.

I went with the 21/0/9 mastery set up but you can also put the 9 points in defense if you really feel like you need it.

This is just what I prefer to buy. But you can also go for the utility build path, which I do not cover.

You max Q when you want to clear well and of course poke high range mages like Xerath,Ziggs... And you max W when you play against melee or short range mages who have some mobility like Gragas. Since then you wont miss them and if they have to get close that's always a threat.

You can pick between Ignite/Heal/Barrier or even Ghost/Teleport with flash. Personally I chose depending on my enemy. Like against a Fizz I'll take barrier or Heal against Brand ...

Pros:
~High mobility
~Good poke
~Good wave clear
~High burst on a low cooldown

Cons:
~Squishy
~Needs you to hit skillshots

She's a great soloQ mage. With good mobility and burst.