Hi there i kinda didnt notice your comment but i hope im not too late. The 3 main keystones are Electrocute, First Strike and Conqueror. I dont really like the way First Strike plays since it makes your early a lot harder and thats also the weakest stage of Zed so i just dont use the rune anymore. I take electrocute most of the time since its just the most consistant rune. Its mainly good against mages with or ranged champs but can be played into every matchup, but sometimes you wanna take conqueror. Conq is better than electro when you are taking longer trades like against vlad irelia or yasuo. Lets take vladimir for example. The way you easily win the vlad matchup is you all in him at lvl 3 or 4. After WEQ lands on vlad you swap in and you need to aa him a bunch of times and thats where conqueror outshines electrocute. Its also better than electro in almost every teamfight. Im planning to make the guide more in-depth in the future and i'll explain how to play with both keystones. In a nutshell against burst champs, ranged champs and mages you cant go wrong with electro, but give conqueror a try into a few short ranged champs like yasuo, irelia, vlad. Hope this little comment helps you and to everyone who reads it.

I take Conqueror against melee champs like Yasuo or when the enemy team has 3 or more tanky champs. Otherwise i take electrocute.