I still consider myself as new to FI and car actually

can somebody give a lesson on fuel system??
how does it work??

fuel pump got fuel from fuel tank, then goes to the fuel pressure regualtor?? fuel rail, injectors, whatever ever??

please explain the stock fuel system, and also with: adjustable FPR, FMU, fuel rain, injectors, whatever aftermarket fuel stuff that is avaiabile

thanks a bunch