When you move items around a page they will snap to the Page Margins and the centre points of the page. You can also set items to snap to other things:
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Snap to Grid makes objects snap to the background grid, even if it's not currently visible. |
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Snap to Content makes objects snap to other objects. This is particularly useful when you want to line up different objects on the page. |
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Snap to Indicators makes objects snap to the guides and page margin. |