My mom has a 2010 Nissan Maxima. She tried starting it a few days ago but there was nothing. All the lights comes on the dash, the radio, the dome lights. The car is in park. The steering wheel is not locked up. I can't find anything online about why it's not starting. Help?

 

Try starting it in neutral with foot on the brake pedal of course, if it still doesn''t start and the battery/battery connections are known to be good it sounds like the starter might have died. If you're mechanically inclinded, you can tap the body of the starter gently repeatedly with a metal wrench (don't smack the + on the solenoid lol) and have someone try to start it while you tap the starter. If it starts at that point, it's the starter

 

Dead battery.
Replace the battery with a new, fully charged one, clean the positive and negative terminals, and happy motoring.