I'm completely new to flying sims (I come from train sims), but I downloaded DCS World on Steam for free and lo and behold, in combination with a HOTAS and my Rift S I definitely am starting to like this (with an open canopy 2km above ground, I even get flight phobia, neat). So my question is, where can I learn about flying and what should I learn as a total noob? Like, flying in general I guess, not necessarily restricted to military flying. Just in a manner that is realistic and applicable for sim flying.
I plan on buying the F/A-18C Hornet module and Microsoft Flight Simulator 2020 at some point, btw.

Also DCS World thread? DCS World thread.