also, what exactly is getting reduced at the cathode? the actual metal or is it also the cations that are getting attracted there?

what i do not understand is electrolytic cells. i understand the nonspontanteous flow of electrons from the now positively charged anode (first of all, how is it positively charged and moving electrons away from it?) to the negatively charged cathode (second of all, how does the cathode accept more electrons if it already has all of them?), and third of all, what is the point of the anode moving electrons to the cathode with the addition of energy if the whole point of the electrolytic cell is to restore the pre-galvanic cell conditions? idk im lost

so the oxidation number of O2 is zero but the oxidation number of O2- would be -1?