What is it when My car wont crank and wont star

make sure you have power to the starter, also check the relay in the fuse box. If you have power to the starter and it does not engage the next step would be to see if the starter solenoid is getting power when the key is turned on. If you have power than it is likely the starter. If you do not have power you need to trace the wire with a wiring diagram.

Check battery voltage while trying to crank the engine.