Kiddush is a Torah commandment derived from "Remember the Sabbath day" — meaning sanctify it in speech. The cup of wine is a rabbinic addition to the Torah obligation.
Question 2
You've said kiddush in the living room. Can you eat in the dining room?
Kiddush b'makom seudah: the kiddush must happen where you eat. Say it in the dining room, or move to eat immediately where you said it.
Question 3
You have no wine for kiddush. What do you do?
No wine? Two whole challah loaves work for kiddush. The bread substitutes for wine as the vehicle for the sanctification blessing.
Question 4
Why do we smell spices during havdalah?
The Rambam explains: the soul is forlorn as its extra Shabbat dimension departs. Spices revive and comfort the ordinary soul during this transition.
Question 5
When Yom Tov falls on Saturday night (Motzei Shabbat), what is the special procedure?
YaKNeHaZ: Yayin (wine), Kiddush (Yom Tov kiddush), Ner (candle blessing), Havdalah (from Shabbat), Zman (shehecheyanu). All combined in one ceremony.