How to cancel changes in Panels that does not contains a "Cancel button"

Hi,
I'm new to Mac, and noted that some dialogs does not contains a "Cancel" Button. Is there some "keyboard combination" that can be used to revert any change made? My main concern is about "Preferences Panels" which can suffer a really mess with unfamiliar users walking there.
Thanks in advance

Hi,
Thanks you both for the advices. I already have used the Command Shift 3 shortcut to 'backup' my settings, just as safety procedure . The Close button instead doesn't cancel the settings changes. It only closes the window. As an example, try to change the 'Currency' field in 'International' Panel, in 'System Preferences'. You will note that it changes, even closing the window. The lock button is my safeguard, and I turned it on in most panels that I saw, but unfortunately it doesn't exists for every panel. I guess must 'take a shot' of the settings, before testing any changes.
It should be really usefull have a 'Edit / Revert Changes' menu item, for instance.
By the way, does Time Machine backups System Preferences?
Thanks for your help

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