Zed Main (Trying)

I started playing league an year ago, and I am a Zed main. Even thou I play him in most of my normal games and ranked games, I still want to improve my mechanics on the master of shadows. I realise that no matter how much Zed I play or how many mastery points I have on him , there are definitely thousands of other Zed mains way better than I am. Cus of that, I hope if any Zed players would give me some advice for becoming a better player, and perhaps some combos for me to try out in custom or normal games.

I know that your build is crucial, I found out that no matter what my matchup is i usually build that same thing over and over again. I realise that good Zed players build different stuff for different matchups, scenarios....etc.

Thanks..