In order for your resources to be bookable, they must have adequate availability. In addition to presences, there are also absences that you can record. In your profile settings, go to "Availabilities" -> "Absences". Here you can switch between the profiles of your resources so that you can see which absences have been recorded and for whom.
Click on "+" to add a new absence.
In the following you can either enter an absence or import holidays.
First select the relevant resource. Then enter a reason for the absence including date and time.
If you activate the "Add as global absence" slider, the absence will be applied to all bookable resources. This can be used e.g. for a team event. Click on "Add" to save the absence.
You can also fully automatically import holidays by postcode. You can find detailed instructions here.
Add absences manually or import holidays automatically. If you have connected an external calendar and you enter absences like meetings, holidays etc. there is no need to create them manually. They are synchronised and it is much easier. Click on the link to learn how to add an external calendar.
You can also define your availabilities in the step-by-step guide. You can find the instructions here.