create Record/Task/Event

You could create records, which don't have to be related to the record of the workflow.
All documentation from "set value" task are also true for this task.

There are special tasks for calendar entries, because they have to be created in a special way

Because of a different internal handling, you have to enter only the start date in the field “Start date & time”

If you click the link in the task configuration you could enter a environmental variable, which should hold the id of the created record. This ID could be used later in the workflow.