How to know if a CloudTrail event is a Management Event or Data Event?

If you look at the json of an event, you'll see a property "managementEvent": true, if it's a management event.

In CloudTrail, you can go to Trails > click on the trail > and then you'll see a section for management event and data events, and you can edit those to choose which of either to include in your trail. That way you'll see a list of all currently supported data events.

For more:

• Details on management events.
• [Details on data events] (https://docs.aws.amazon.com/awscloudtrail/latest/userguide/logging-data-events-with-cloudtrail.html).