Resource are typically things like meeting rooms or projectors etc, i.e. things that are used durings appointments. Resources can be booked for appointments to ensure that a resource is not double booked.
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To see available resources you'll need to access the Calendar module and click on the Resources menu and then Overview RESOURCES > OVERVIEW menu.
Here you'll get a GANTTGantt-view of the different resources created in your solution and see what resources are booked and available.
You can book the resources while creating an appointment
