Syncing iphone to a new mac laptop?

I just bought a mac laptop and want to sync my Iphone to it. It was previously synced to my sisters. I want to do this without losing my photos, contacts and messages, I don't really care about music so much. I know there's a way of doing this because a friend has done it before they just can't remember how because it was a few years ago.

I thought that apple products are idiot proof…

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