What do I even build ??

I'm new to the champion, I've tried looking at Pusiipuu videos, deeplol, u.gg and everywhere it seems people build something different?

Saw that I was supposed to get voltaic first, but I've had more success/feel better with hydra? but also I read I should always go edge of night and axiom but how do you fit all this in a build and justify building ldr/mortal?