Car won't start, battery is good and all you here is a clicing Noise?

The contacts in the starter motor solenoid are worn, the clicking that you can hear is the solenoid being pulled in, but not making contact to allow the main battery voltage/current from getting to the starter motor. Their are 2 things you can do to get you out of trouble, if you are stuck somewhere and cant get going.

Rock the car back and forward whilst in gear, stop and try again.

Tap the side of the starter motor cover with a piece of wood or soft hammer. This will wiggle the contacts and allow for starting.

These may get the car up and running, but ultimately the contacts will have to be replace.

If you can find the starter motor, the solenoid is the small round or triangle box on top or to the side of the starter motor, usually with two small wires going to it.

This is not a big or usually an expensive job to replace. Replace the contacts before replacing the starter motor, a lot cheaper alternative.