When you create a repeating event, we refer to this as an Event Series.
You can edit and manage an event as a single instance, as the entire event series, or as an instance and all the following instances in the event series.
When you edit instances of an event series, you will be able to the which instances were edited In the Edited Date(s) section.
If you edit an instance of a repeating event plus all of the following events, this will create a separate Event Series from the initial Event Series.