What significance is given to a firstborn daughter “בכורה” in yiddishkeit? I know the Chazal “בת תחילה יפה לבנים”. Are there other relevant Chazal? Is there even such a word/concept of “בכורה”?
I am not aware of any major significance to a bechora. The Shulchan Aruch O:CH 470-1 brings an opinion that a bechora fasts on erev Pesach, however the Rema argues on this and says that it isn’t the custom to do so. Other than that if you have any halachic differences, I’d be interested to know.