gewinnbringend
profitable
In such a way that it yields a financial gain or profit.
Er hat sein Geld sehr gewinnbringend in Immobilien investiert.
He invested his money very profitably in real estate.

profitable
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profitable
In such a way that it yields a financial gain or profit.
Er hat sein Geld sehr gewinnbringend in Immobilien investiert.
He invested his money very profitably in real estate.

The word is made up of 'der Gewinn' (profit/gain) and 'bringend' (from the verb 'bringen' (to bring)). So it literally means 'something that brings profit'.
Der Verkauf des alten Autos war nicht besonders gewinnbringend.
The sale of the old car was not especially profitable.
The context makes the difference: if it is about money, stocks, or business, the financial meaning is intended. If people are talking about experiences, discussions, or reading, the personal benefit is meant.
Er sucht nach einer gewinnbringenden Geldanlage.
He is looking for a profitable investment.
In the financial sense, 'gewinnbringend' (profitable) is often used with verbs such as 'anlegen' (to invest), 'investieren' (to invest), or 'verkaufen' (to sell).
Sie hofft, ihre Aktien gewinnbringend zu verkaufen.
She hopes to sell her stocks profitably.
In the figurative sense, the word describes an enriching experience. Typical nouns here are 'Erfahrung' (experience), 'Gespräch' (conversation), 'Zusammenarbeit' (collaboration), or 'Lektüre' (reading).
Die Lektüre dieses Buches war für mich sehr gewinnbringend.
Reading this book was very beneficial for me.
useful
'nützlich' and 'gewinnbringend' both describe something that brings an advantage. 'nützlich' is very general: it can refer to practical help, good information, or suitable things. 'gewinnbringend' emphasizes gain more strongly. That can mean money, but also a personal advantage, for example new experience or knowledge. If something simply helps, you usually say 'nützlich'. If the benefit feels like a gain, 'gewinnbringend' is more precise.

Der Sprachkurs im Ausland war für Anna sehr gewinnbringend.
The language course abroad was very beneficial for Anna.
Nach dem Gespräch ist ihr die neue Information sehr nützlich.
After the conversation, the new information is very useful to her.