If you want to offer an online training or class that people can sign up for, you can do the following:
1. Create (online) activity or change existing activity
First it is important to create an activity, so that you can schedule a session in the calendar. When creating an activity, you can set whether you want it to be an online activity at Details > More options.
You can also always change an existing (physical) activity to an online activity and change the session’s name in the calendar, so that your clients or members know that it is an online training or lesson.
2. Schedule session (online training) in calendar and provide link
The second step is to create one or more sessions of the activity in the calendar. Your clients and members can now see and register for the online training or class in the Schedule/Calendar.
You can then specify the link