What's the best way to learn the math behind +/- ev, fold quity, etc?

[ksuno1stunner]

And also learning how to apply it?

Should I just use pokerstove as I go?

Maybe read other people's lines and figure it that way?

I assume the more I use it, eventually there'll be a point where everything is second nature?

I might have already answered my own question, but I was curious how others learned it.