•Use Q to place the dagger behind the target and decide which side of them the trade happens on, then stay long enough to cash the free autos that setup creates instead of treating every touch as a dash-out combo
•In fights, track the spell that actually stops Katarina before you track the carry; E and R get much better once the bind, stun, knockback, or point-and-click interrupt is already gone
•Katarina side lanes best as a short show-and-disappear threat, and when she falls behind she usually gets back into the game by making the map messy enough for reset chains again rather than sitting in a long announced side lane