How to get my stuff back when I update my Iphone?

I haven't updated my IPhone ever yet so when I do can I get my stuff such as my music back or do I have to buy it again?

When you update the iOS only the iOS files are touched. After updating everything will be there exactly as you left before the update.

Do not interrupt the update process. It can take two hours to complete. The phone can restart itself several times during the update. It can look like it is not doing anything. Leave it alone. Let it fully finish the update.

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