Well, that's often device-specific/dependent as far as a factory ROM restoration is concerned.
If you root, then your best path would be to have a custom recovery installed (like ClockworkMod or TWRP) so that you can do a Nandroid backup when/if things go awry...
Rooting without a custom recovery or the knowledge to fix or backout any of your modifications is like a high wire act without a net (and is asking for a bootlooped or soft-bricked device).
Rooting does not automatically imply that you will have or can get a custom recovery--again, that's all device-dependent.
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