How does a prepaid card work?

Can you see personal information on the prepaid card, such as where you bought it?

How do you transfer money to a prepaid card and what information do you need?

And can you also transfer it online?

How do I transfer money from a prepaid card to my account online?

Are there any more popular prepaid cards or can you just buy them from the gas station?

Do you buy a prepaid card and can you top it up again and again up to a certain point, or do you buy several?