Car won't start, can someone tell me what needs to be fixed I'll describe what's wrong?

I tried to start, no noise what so ever and nothing is working. The automatic locks won't work, the lights won't work. I called someone and jump start the car, it started. The guy told me to keep it running for 20 mins. I did that and turned it off. I waited a minute to try to start an it didn't start again! So my car started if jumped and it ran for 20 mins, it probably could've ran longer if I didn't turn it off but I did and when I waited a minute, it wouldn't start again. What could be the problem? Need new batteries? If it's the case, if I jumped the car and went to an auto parts store, would the car stop running in the middle of driving? Thanks in advance!