Coup de cœur is a very common French expression. It does not translate literally word-for-word in a natural way.
It means something like:
It often suggests an emotional reaction or a strong personal enthusiasm, not just a cold ranking.
So Ce vinyle est mon coup de cœur sounds a bit more expressive than simply saying This record is my favorite.
Because coup de cœur is a fixed expression in French. You learn it as one chunk.
French often uses de in set noun expressions:
So here, de is just part of the idiom. You should memorize coup de cœur as a whole expression rather than trying to build it literally each time.
You can say Ce vinyle est mon préféré, and that would mean This record is my favorite.
But there is a nuance:
Coup de cœur often sounds warmer and more expressive, especially in reviews, recommendations, or conversations about music, films, books, and so on.
Yes, absolutely.
So if you are already holding the record, pointing at it, or talking about it, C’est mon coup de cœur works perfectly well.
A rough pronunciation guide is:
suh vee-neel eh mon koo duh kur
A few notes:
In IPA, it is approximately:
/sə vinil ɛ mɔ̃ ku də kœʁ/
If you are learning pronunciation, it helps to treat coup de cœur as one chunk and practice it repeatedly.