
die Handhabung
handling
The way in which you operate or use a device, tool, or vehicle.
Die Handhabung der neuen Kaffeemaschine ist sehr einfach.
The handling of the new coffee machine is very easy.
handling
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handling
The way in which you operate or use a device, tool, or vehicle.
Die Handhabung der neuen Kaffeemaschine ist sehr einfach.
The handling of the new coffee machine is very easy.

handling
The way of dealing with a particular situation, problem, or procedure; the manner of carrying something out or managing it.
Die Handhabung von Kundenbeschwerden muss verbessert werden.
The handling of customer complaints needs to be improved.
'Handhabung' (handling) is the noun form of the verb 'handhaben' (to handle). This verb is made up of 'Hand' (hand) and 'haben' (to have) and literally means to have something 'in der Hand' (in your hand), meaning to have control over it.
Er muss den richtigen Umgang mit der Verantwortung erst lernen.
He first has to learn the right way to deal with responsibility.
The meaning depends on what the word refers to. The 'Handhabung' (handling) of a device or tool is its operation. The 'Handhabung' (handling) of a problem or situation is the administrative or strategic way of dealing with it.
Die Handhabung dieser Software ist nicht sehr intuitiv.
The handling of this software is not very intuitive.
Common adjectives combined with 'Handhabung' (handling) are 'einfach' (simple), 'kompliziert' (complicated), 'sicher' (safe), or 'korrekt' (correct). These describe how well or poorly something is operated or managed.
Eine einfache Handhabung war uns beim Kauf des Geräts wichtig.
Easy handling was important to us when buying the device.
treatment
The Behandlung (treatment) of a device generally describes how one handles it. Handhabung (handling) refers more specifically to operating or using it in practice. When individual actions and ease of use are important, Handhabung is the better choice; Behandlung is used for general handling.

Die einfache Handhabung der Maschine erleichtert die tägliche Arbeit.
The machine's simple handling makes everyday work easier.
Eine vorsichtige Behandlung der Maschine verhindert Schäden.
Careful treatment of the machine prevents damage.