When in the training module, and clicking on the green + button, a modal pops-up: 


PlanPlanning a training means you add one or more training appointments in the calendar, whereby it's possible to save these without needing to already create the training content.
CreateCreating a training means you first create a training appointment in the calendar and as a next step, creating the training content.
CopyCopying a training means you select an old training, and copy the content to a new date.


General info: user functionalities depend on the roles & permissions settings. If a certain functionality does not work within your user account, this will be because you don't have sufficient permissions for this.