What happens if I don't use an apple charger for my iphone?

My cousin said if I don't use a apple brand charger for my iphone it will stop working and break my iphone when I update it. Is that true?

No that is not true. As long as the charger is meant for the phone it will charge the phone.

You can use any charger, I would just make sure if you buy one online that its not shipped from china.