No Start

I just bought my Pontiac G5 2007 two months ago. On Thursday I went to the store came back out got in my car and it would start. Didn't make no clicking noise nothing. My friend came gave me a jump after maybe 2 seconds of the cables being connected it started right up perfectly fine. I was able to drive the car all day. Going places shutting the car off for hours. And able to restart it no problem at all. That night around 9:30 I went to start it and well it won't start lights again work fine hazards blinkers signals everything. Only lights that are on are my service airbag light and that's it. In the box where it shows my mileage it says power steering and low fuel. I went to the gas station filled up gas can put it in my car still won't start. And I know it has a half tank of gas at least I'm so stressed don't know what to do I start my job on Tuesday. Hopefully someone can please help me to figure out what the problem is