Most power supplies will have a whole bunch of cabling and connectors coming out of the rear.
Most power supplies will have a whole bunch of cabling and connectors coming out of the rear. Others may have sockets for cables to be plugged in. We find it easiest to connect the power cabling for each hardware component to the power supply as you assemble the PC (rather than waiting until the all parts are assembled and plugging in all power cables at once); we do it this way so that you won’t accidentally forget to connect power to any device.