Sometimes when I try to start the car, it wont crank over?

Hello,

If you turn the key and it does not crank, then it is possibly a faulty starter or a starter relay.
Do you hear a click when you turn the key?
If you hear a click that means you are getting power to the starter solenoid but it is not turning the starter. Which will lead to a faulty starter.
However if you turn the key and you do not hear a click it could be the starter relay. The relay is located in the fuse box under the hood.
Another possibility is a faulty ignition switch. The ignition switch is the electrical switch that the lock cylinder attaches to. When the switch becomes faulty it can trigger no start no crank issue as well.

You might find this article helpful:

https://www.2carpros.com/articles/starter-not-working-repair

Please let me know of any questions.

Thank you.