Double-click either of the on-screen rulers to get the Tools | Options | Document | Rulers dialog box. At the top are the Nudge settings. By default, Nudge is set to .01 inches. I'm happy with that. The default Super nudge is set to 2. I change mine to 10. Similarly the Micronudge is set to 2 and I also change that to 10. Your preferences may differ. Once you've made your choices, click OK.
Select an object and press one of the arrow keys. It will move by .01 inches (or whatever you selected). Now how Shift and press an arrow key. That is a super nudge and mine will move the object by .1 inches. Try again using Ctrl and an arrow key and you get a micro nudge. For me that is .001 inches. If you are happy with the settings, choose Tools | Save Settings as Default and every new document you create will use those nudge values.