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You can create and edit resources via the settings which are explained here: 2020-09-04_09-57-50_Resources settings.
To see available resources you'll need to access the Calendar module and click on the Resources menu and then Overview.
Here you'll get a GANTT-view of the different resources created in your solution and see what resources are booked and available.
To book a resource simply follow this guide: 2020-09-04_09-58-04_Create a calendar appointment
You can book the resources while creating an appointment