Event triggered by saving in plugin panel - Joomla! Forum - community, help and support

i know event use reteriving parameter data after administrator press save or save & close button in plugins page within administrator panel.

i'm curring using oncontentprepare reterive , show data not much. plugin reterives data has saved administrator in panel , saves data css. css inserted header of joomla when users view webpage. perform first section reterving , saving data in event triggered when administrators press "save" or "save & close" button in plugin area.

so event should use?

i apologize if 1 duplicate post. tried search didn't clue in forum.

any or advice appreciated.

oncontentbeforesave function;