For the source text click/tap here: Pesachim 103
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As we learned in the last daf, when Yom Tov begins on Saturday night, we combine the Havdalah that ends Shabbat with the Kiddush that begins Yom Tov over a single cup of wine. The discussion on our daf deals with the order of the various berakhot that will make up this combination of Kiddush and Havdalah.
Ironically, Judaism defines something as kadosh when it is separated and consecrated for a special purpose. The biblical call to be holy is a call to distinctiveness; whether separating from sexual immorality (Rashi, Vayikra 19:2) or eschewing those activities that might be technically permissible, but are corrosive (Ramban).
In order to make kiddush, we must make Havdalah. Yet it is kedushah that is our ultimate goal, and it is kiddush that must precede Havdalah.