How do people get more efficient at getting headshots? And how do they know (roughly or precisely) at what hight to aim in order to maximise the chance of getting headshots? I've been trying to use objects in the map (which I've read is how...

It doesnt have to be cheap, its just an option, imagine a minima collection with clean crispy sounds, or a viper shorty with nice sfx and vfx... It gives life to skins that will mostly be secondary and RIOT could offer the price of upgrade...