Hi all! I am Khanatila. Katarina Katarina main in plat with 81% WR . I don't care which lane or possition I am, I just pick Katarina everywhere. In my guide you can see some builds i had tried and worked well. I hope my guide will be helpful for you. So lets begin.

Katarina Katarina basic lane poke combos that i use are:
E(on enemy) W Q aa passive E(on Q dagger)aa E back or just run if he is not threat to you!
Q E(on Q dagger)W double passive aa E back.
I think farming with Kat Katarina is not so hard because of her passive, also with your Q you can take down 3 minions from the wave. For farm and poke enemy you can also use Q on minion E W your enemy should run away and you take 4-6 minions from the wave.
Katarina's max dmg combo is Q E W R(for picking 2 daggers with your ulty) this combo is good only if your enemies don't have big mobility or they are in hard mach up and don't have time for react normally...
For 1v5 or team fights I prefer this combo:
E W Q R E(on Q dagger)it is so mobility here you have 3 times your E, also focus the easiest to kill enemy first because when you successfully kill one you will res your skills to kill second and then ult again.
There are also comboes with hextec gunblade:
Main:
Q E aa gunblade
Other:
E W aa gunblade
Another:
E W Q aa gunblade E
If enemy is so low:
E gunblade
You can use ur gunblade to slow enemies u r chasing:
/EXAMPLE/ gunblade Q E R

Many of you probably don't know which runes to take... Okay lets see. Electrocute are really good early game. I use it in hard mach ups like Talon, Diana, Malza. Dark harvest is good vs squishy team where u can dominate. Bad thing about dark harvest is that it surfers your early game. Conqueror is rly good when the enemy team has tanky guys or over 2 tanks. For me the runes depends on the mach up. So just try them in different situations and check when you prefer to use electrocute, when conqueror and when dark harvest.You should just play more and find out the best runes for u :)