Set the default country, so that it is always filled in when, for example, creating a new object.

Set the default language for the application, individual users can change it later in their profile.

Set the default date format for the application.

Set the default currency for the application.

What types of object do you sell or rent
This determines for all users of the application whether or not they are shown in the left menu at PIM.
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For example:
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Apartment and house are both grouped in the left menu under Residential.
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​Result in the left menu shows:
New construction, Relet, Commercial, Agriculture, Parking lot and Building plot.