Xayah's attacks and abilities leave Feathers on the ground that she can later recall for massive area damage and control.
Xayah can use Featherstorm to dodge almost any ability while also creating a ton of Feathers. Try to utilize the offensive and defensive aspects of this ability.
Xayah's Bladecaller will only root targets hit by 3 or more returning Feathers.
Long fights in the same area with Xayah will allow her to drop a lot of Feathers. Try to stay on the move!
Make sure you are ready when you go for the kill. Untargetability from Featherstorm can quickly turn an ambush in Xayah's favor.