Do YOU want to carry more games ? Be MORE usefull to the team ? - Welcome t
First of all, be aware off Katarinas combos and mechanics. To get aware of them, watch some LCS Players or Youtube Videos. Katarina isnt hard to play when it comes to easy kills, but thats not the most important part to win. The most important thing is to KNOW WHEN and WHERE you should INITIADE and KNOW WHEN and WHERE to go into TEAMFIGHT... So you masterd this and you are infamiliar with the basics of LoL ? Than Jump Ahead ! :D
Greater Mark of Magic Penetration x9
Greater Seal of Armor x9
Greater Glyph of Magic Resist x9
Greater Quintessence of Ability Power x3
Why don't I chose to pick Ability Power Glyphs ? - Well we woun't build any defensive except Zhonyas - this Glyphs will make your early game easier.
If you want full DMG than pick Magic DMG Glyphs - bear in mind that your early will be harder.