Hello. This is how i play katarina and i think its preety good... enjoy.

Plain and simple early game power and and defence...

Always Flash... Ignite or Teleport is the second option... ignite most of the times and teleport when the enemy team has twisted fate or shen

Pros:
-can carry a game
-very mobile
-huge burst when dfg is bought
(can kill adc or apc in 2 sec max)
-can change a course of a teamfight if played right

Cons:
to sum it up USELESS if not played right

Always try to last hit without using skills... but if the enemy pokes you then you have to poke them back... so use Q as soon as you can... when he goes 70% hp go Q>E>w, this will get them to about 55-50% hp... keep poking them the same way as much as you are allowed to but be carefull not to overextend. ALWAYS have your lane warded because you are a first priority lane to be ganked.

as mentioned before try to last hit as much as possible... but if your enemy is pushing/poking you then you will have to pushe back and poke him... when the enemy goes at 50% hp ask for a gank(this is a sure kill with a jungler) if your jungler is away poke him more... get them to 20-30% hp. after that they will either go back to regen or die before they have a chance.
If you are losing the lane and getting pushed really really hard then ask for a gank all the time... you may also ask for a gank when you go level 3 to force the enemy to go back or take the kill


NOTES: enemy 60-100% hp poke with Q and W when you have a chance.
enemy 40-60% hp go Q>E>W and back off
enemy 0-40% go Q>E>W>R>Ignite he will either die or go back to regen... if he stays ask for a gank to take the kill

I know that this build is very plain but it will be fixed in the future if rating are good... also i will add Laning matchups if this goes high.