Katarina can farm effectively early game with Bouncing Blade but is melee so needs to be careful during the laning phase.
Don't initiate team fights with Death Lotus. Instead let your team initiate and then come in to the middle of the enemy team with Death Lotus.
League of Legends Katarina players could find her to be a confusing champion to build out properly. You'll notice that her build is modified when she is playing against either diversified or specialized team compositions, indicating you shouldn't follow the same Katarina build every round of League of Legends
The best items to use in your champion's build include: Hextech Rocketbelt, Rabadon's Deathcap, and Lich Bane. Those who included these pieces in their kits had a better winrate than players who worked towards other Katarina builds. Similarly, if you are facing a varied enemy team arrangement, you should really consider grabbing her the Precision, and Domination runes. In recent matches, she won the largest percentage of her matches when equipped with these runes.
We came up with our Katarina build recommendations by examining 75,856 recently ranked LoL rounds with her selected. We only propose the top winrate Katarina builds that have been built by ranked League players enough times for us to advise them. With so many matches in our data, we are confident in our recommended builds.