I wanna work at a electronics store (i.e best buy, or future shop)?

I wanna work at a electronics store perferly best buy or future shop. Does anyone know the age i must be to work there ? Also do i have to know anything going into the job? Like types of electronics, high rated products or stuff like that. I would really like to know what i need to get a job there. Please metion any other important details i should know before trying to get a job there. Thanks it would help a lot !!
 
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