After I learned the Sicilian, I started to love to play as black, while before it my win rate with white was bigger than black (as expected due to white first move advantage). When I learned Sicilian exists, I started to win a lot as black (also in my low level of play I rarely see Sicilian used against me...)
I don't bother learning all Sicilian variations, I just move the C pawn first, and 'go with the flow' as needed, and with experience learn some of the more unusual moves (like moving pawns or knights in counter-intuitive ways after I notice in analysis why they were good idea, and then I learn later that it is a named opening).
How I do that as white? Right now all I do is spam Wayward queen, that sucks, but seemly other players suck more and lose to it anyway, the problem is that Wayward Queen attack is entirely a gamble, if other player sucks, I win, if other player is good, I lose.
I want some better white opening I can rely on as beginner, like I do with Sicilian for black.
I know there is another question about white openings, but that question talks about lots of openings, I want ONE flexible opening I can rely upon and learn its variants as I play, like it happened to me with Sicilian.