It's to your credit that things that may not have been on your radar previously have found their way onto it.
With long range shooting it's physics, chemistry (I make my own ammunition), aerodynamics, environmental, physical/self-mastery/discipline, and other such things that culminate to arc a bullet a mile and more onto a target with a high hit-probabikity and repeatability. It's actually quite fascinating and rewarding...and I'm just a scrubber who knows just a thing or two after 35+ years.
There's many books available, I have studied using most of them, but the one below is good. Having said that, it assumes a certain level of understanding so might be a bit much for someone not quite there yet.
"Applied Ballistics for Long Range Shooting" Bryan Litz