If you turn the key and the engine does NOT crank over (try to start) then test to see if the battery has any power. Turn the headlights on and if they come on strong then your battery is good and something is wrong with your starter. If the lights do not come on strong then your battery is empty. You will need a jump start using cables. After that run the car for 15-20 minutes without stop. If it will not even run after the jump start then your alternator is bad. After running it for some time turn the car off and try to restart it. If it starts your battery is still working. If the car will not start again after running it for 20 minutes then you need a new battery because your old one is not charging up anymore.
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If you turn the key and the engine does NOT crank over (try to start) then test to see if the battery has any power. Turn the headlights on and if they come on strong then your battery is good and something is wrong with your starter. If the lights do not come on strong then your battery is empty. You will need a jump start using cables. After that run the car for 15-20 minutes without stop. If it will not even run after the jump start then your alternator is bad. After running it for some time turn the car off and try to restart it. If it starts your battery is still working. If the car will not start again after running it for 20 minutes then you need a new battery because your old one is not charging up anymore.