Katarina is a burst mage assassin.Your combos will depend on your E and your E resets, picking up your daggers. As kat, you should go into team fights with a tank in front of you so that they take the abilities and damage. And you should focus on the supports. Due to your E and your E resets, you can get a kill on the supports and quickly get out of any situation.

There are some combos that you can do as kat. When getting level 2, you should try to burst them with a short Q E E combo. You can have an aggressive engage under level 6 with with E W Q E and above E W Q E R E.