OK, you need a much deeper system knowledge.
I thought you would be able to tell us that there are five(seven), sources of electrical power on the A320, and what they are:
One Main Generator on each engine, one Main Generator on the APU, a RAT powered emergency generator, and aircraft batteries. Any single Main Generator can power the whole aircraft, (on the ground or in a flight emergency, with Galley Shedding). (and each engine FADEC also has its own electrical generator, making a total of seven electrical power sources). You need to know all this, along with switching priorities and electrical capacities of all the various power sources, How long can you fly on batteries alone, for example ? How is the power distributed. Which aircraft systems use AC, which ones use DC ? How is the DC power generated ? What is the RAT, and when is it used ? You must surely have looked at the ECAM system pages for all the aircraft systems ??
There are three separate hydraulic systems, with seven(eight) sources of hydraulic power: One Main Hydraulic pump on each engine. A Main Electric pump powering a third system full-time, (which one ?). An electric pump which can intermittently power the Yellow system in a limited way, a PTU, a RAT hydraulic pump, and brake accumulators. You can fly and land the aircraft with only one hydraulic system - with certain restrictions. (There is also a hand operated pump on the Yellow system for ground operations). You need to know all this, and which major aircraft services are powered by which hydraulic system(s).
Were you not given a copy of the Airbus A320 FCOM ? You should have studied each system in depth; Electrics, Hydraulics, Fuel storage, supply and transfer. Fire and Smoke, Pressurisation, Air conditioning, Gear and brakes, Flight Controls, FBW - computers, computer priorities. reversions. Autopilot and flight directors, FMGS, Indicating and recording systems, Auto-thrust, Navigation, Ice and rain protection, etc. You should have had an exam to test and prove your knowledge on each system.
I am not trying to be clever here, nor am I having a go at you, This is all basic knowledge and I am shocked that you have not been taught it by your ATO, (Approved Training Organisation). Why are you having to watch Youtube videos - you should have, and need to, study the proper Airbus manuals; the FCOM, (Flight Crew Operating Manual), and the FCTM, (Flight Crew Training Manual).