Car won't start it just cranks. Engine just turned off when I made a right turn on my street. Lights and music we're still on

First thing is first do you have a check engine light on or did you have one on before vehicle started acting up. Engine needs to be scan for codes first then start from there

Yes the check engine light came on a day or so before it shut off. When the light came on I took it took the vehicle to auto zone for their scan and the thing that popped up was the alternator (note. I just bought the car from someone too.)

More the Likely alternator since it did set that code.