Hi! My IGN is LodHic3 and have been an Xayah main since her release. I've been building this the whole time and would say it's the best build i have ever tried. I have also managed to get a 67% winrate in season 7 with her, and a current winrate of 64%. With a total of around 200 matches with her. I would recommend Xayah to anyone who likes having fun and is open to learn. Xayah scales very well into the lategame. Keep in mind that this is my first guide and i am relatively low elo.

Your Q is a tool for getting your root. In lane, try sending out a Q towards the enemy champion and a couple of autos to assert lane dominance, if they walk too close, root them and use your W for damage. A quick root combo: Q + AA + E. If they are walking towards you or standing still, try getting multiple feathers out before using your E.
Clearing a wave is really easy with an Q + AA + AA + AA + E.

Your W has alot of damage potential and maxing it second boosts your DPS. Once you have your BF sword and a zeal you can quickly kill any squishy support or Adc with just a couple of autos. If you use Q and quickly use your W to get a couple of feathers out, you will get 5 feathers in just 3.5 seconds. If you use your E just after you will kill or get any squishy low.

Your E is your burst and main damage source, it also helps you lock down enemies. Landing it is crucial to getting kills. Doing a fast combo roots an enemy and you or your team can easily kill the target.

Your R is your getaway and could also be used as a fast way to get out some feathers. If you get in a really sticky situation, try ulting and flashing mid ult to your turret or team. In laning-phase, if you get in a fight try to dodge an ability with it, for example nautilus ult or a nami ult, to save yourself and also doing massive damage to the enemy if you E after. If you can, save your ult for something big like a Veigar ult or a Fizz ult.

Pros:
Xayah is good in pretty much any game and situation.
When mastered, you can easily carry any game by rooting and killing the entire team in a temafight. Good wave clear and can take down turrets very fast with her W. You and Rakan fit very well together and can dominate lane and teamfights together.

Cons:
Can get killed very easy if you dont have ult available.
An easy target without a defensive support.