I need to clear up my (mis)understanding about QFT. Does QFT show how a particle propagates through spacetime? (Or maybe this is the realm of QM) Or does QFT only specify how a particle propagates as a particle through time without reference to where in space it is? But... if QFT specifies how a particle propagated through spacetime, then does it account for the kinetic energy in terms of these virtual particle processes of QFT? Thanks.