Everyone here has been through it,there is no magic answer, there are the basic's as above,
after that to know how many clicks equals what range and all that stuff you need to know velocity, projectile weight, ballistics etc, etc.
It will be different for different pellets/BB's in your rifle, which will be different to someone else's rifle, oh and with multi aim points (mil-dots) when you change scope mag the drop between dots also changes
it's not easy like in the movies![]()