The notion new writers have that they need to know all there is to know (as if that’s even possible) about writing before they call themselves writers is so wrong and honestly pretty much unrealistic.
No one knows all there is to know about writing. We all just continue to explore our abilities, learn new things and increase our capabilities.
Ask anyone who is on a roll in this profession, they do a whole lot of exploring and trying out new things. If you are hesitant to do this you will not go very far and that’s the honest truth.
So explore and improve yourself daily.