Will there be any issues if I update iOS of a non jailbroken iPhone 5?

I'm new to apple products and I'm worried, if there will be any issues with my iPhone 5, if I update its software.

No, there's nothing to worry about. Just backup your contacts to iCloud and backup music, photos etc to the computer just to be on a safer side

No, there will be no issues. Just wait for it to update and then your phone restarts and it will ask you questions on your first time but your phone will be intact.

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