Check the battery: Make sure the battery terminals are clean and tight. If the battery is dead, you may need to jump-start the car or replace the battery.
Check the fuel: Make sure there is fuel in the tank. If there is fuel, check the fuel lines for leaks.
Check the spark plugs: Make sure the spark plugs are clean and properly gapped. If the spark plugs are worn out, you may need to replace them.
Check the ignition system: Make sure the ignition system is working properly. This incluye the ignition coil, distributor, and spark plug wires.
Check the starter: Make sure the starter is working properly. If the starter is not working, you may need to replace it.
If you are unable to find and fix the problem, you should take your car to a mechanic.