cords

CAR: 2012 NISSAN ALTIMA SR I'm having problems trying to figure out what these cords or inputs are for please help

I'm new to the whole speaker system thing and I just needed some recommendations to get the most bang for my buck. I have a 2007 Chevrolet Silverado Crew Cab, I was having a lot of trouble finding a box that fits in my truck and is big enough for good subs. I don't have anything other than tools...