Why won't my car start?

It is Saturday and I won’t be able to speak to a mechanic until Monday. I went out to my car and pushed my remote to unlock it and it unlocked just fine. I got in the car and tried to start it, but NOTHING happened. No lights were left on, no doors left open, and nothing else was on overnight. I turn the key, no noise, no click, no lights, no power what so ever. I hooked up my jumper cables and the lights automatically came on. When I tried to start the car, while it was hooked up to the cables, it made a loud clicking noise, but would not start. What could be the problem? I just went to the car and found that my glove compartment light comes on very dimly when I open it. My thoughts are battery, starter or alternator. My battery is 4 months old and I have a warranty on it, so I may be in good shape if it is the battery. My starter is just a couple of weeks over a year old. Not the best with cars though. I can change a tire, jump a battery, and check the oil…that’s about it.
I just want a heads up on what the issue could be before I step foot into a shop or have a mechanic come over. I’m a female, and I want to start out with an idea of what it could be. Don’t want to be screwed.