downside / reverse side
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downside
The negative, disadvantageous aspect of an otherwise positive thing or situation. Often used in the expression 'die Kehrseite der Medaille' (the other side of the coin).
Der Erfolg hat auch seine Kehrseite: Man hat kaum noch Privatsphäre.
Success also has its downside: you hardly have any privacy anymore.
The word is made up of 'kehren' (to turn, in the sense of turning something over) and 'Seite' (side). So it literally describes the 'turned side' or back side, which is used both concretely and figuratively.
Jede Geschichte hat eine Kehrseite.
Every story has a downside.
You can recognize the meaning from the object. If people are talking about physical, flat things like a coin, a photo, or a sheet of paper, it means the back side. If they are talking about abstract things like success, freedom, or a decision, it means the negative aspect.
Auf der Kehrseite des Fotos stand ein Datum.
There was a date on the back side of the photo.
The idiom 'die Kehrseite der Medaille' (the other side of the coin) is especially common. It is used to emphasize that an apparently good thing also has a disadvantage.
Er ist berühmt, aber die Kehrseite der Medaille ist, dass er keine Privatsphäre mehr hat.
He is famous, but the other side of the coin is that he no longer has any privacy.
To name the negative aspect of something, the genitive or the preposition 'von' (of/from) is often used.
Das ist die Kehrseite des Ruhms.
That is the downside of fame.
advantage
'der Vorteil' and 'die Kehrseite' often refer to the same thing, but from two different perspectives. An advantage is the good or useful part of it. 'die Kehrseite' is the negative aspect, especially when something looks positive at first glance. 'Kehrseite' often sounds like: yes, there is an advantage, but there is also a problem. The expression 'die Kehrseite der Medaille' (the other side of the coin) is very typical.
Die Kehrseite der freien Zeiteinteilung ist, dass man viel Selbstdisziplin braucht.
The downside of flexible scheduling is that you need a lot of self-discipline.
Ein Vorteil des Online-Kurses ist, dass man die Zeiten selbst wählen kann.
One advantage of the online course is that you can choose the times yourself.