I am trying to figure out how to say "I am good/bad at (something)" in French. There seems to be discrepancies between sources online about what prepositions to use.
For example, I searched "I am good at piano" on an online translator. It gave me many options: Je suis doué pour piano, je suis bon au piano, je suis bon en piano, and je suis doué en piano. I know that you use different prepositions depending on what adjective is used (doué vs bon), but why does this translator give so many options, and which ones are correct?
Also, for example, to say "I am bad at guitar", the translator says you can say either je suis mauvais à la guitarre OR je suis mauvais en guitarre. Which one of these is correct?
Basically, which of these prepositions (en/au/à la/pour) do you use when saying je suis nul/mauvais/bon/doué AT something?
Thank you!
