Trying to back up and update my iPhone?

My iPhone has been having some issues and I went to apple and they told me to back it up and update it on the computer but when I asked how to do this they could not give me any answers for some reason. I plugged it and it's syncing. I have no idea what that even means.Am I doing the right thing? What do I do next?

You just have to update it. When you plug your iphone to the pc/laptop the itunes window opens and at the same time a smaller one that says that there's a new version of ios ect. And you click download and update thats all you have to do. Then it ll take its time to download and update, but that's pretty much what they told you to do.

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