I consider myself an authority on almost nothing. I simply seek out and redistribute other people's knowledge, soaking up what I can along the way.
My wife and I curate a large spreadsheet of chocolate chip cookie recipes comparing ingredients and proportions and trying to quantify the effects of slight variations. We're starting one up on caramel next.
Friday Night is Pizza Night. Has been for my family since I was a child. When I took it up myself in college, my friends quickly grew tired of pizza-sausage-mushroom combinations, so We branched out to all sorts of more interesting variations ( many successful, some not)
Now I try out new pizza crust recipes every few weeks. I'm less concerned with "authenticity" than what pairs best with various topping combinations.