The Conduct expected at a Shabbat meal: Megillah 12b
Better to make Shabbat without special additions, rather than to have to request Charity: Shabbat 118a; Pesachim 112a, 113a
Mitzvah of having 3 Meals: Shabbat 117b-118a
Mitzvah of having 4 Meals: Shabbat 117b-118a Rewards and Importance of having 3 Meals on Shabbat: Shabbat 118a-b
Having 2 loaves of bread, to remember the Desert Manna: Shabbat 117b
Custom to cut one loaf or both: Shabbat 117b
Eating garlic at the meal [relevant to the husband's obligation of sexual relations with his wife: Nedarim 31a
Enjoyment of Shabbat - Oneg Shabbat
Rewards for Enjoyment of Shabbat: Shabbat 118a-b
Earing a meal of turnip, large fish and garlic: Shabbat 118b
Even a dish of small chopped-up fish suffices for this mitzvah, if it is done to honor Shabbat: Shabbat 118b
Shabbat as a "special spice" for the Shabbat meals: Shabbat 119a
Enjoyment of Shabbat where it will cause Loss of Time for Learning Torah: Shabbat 119a-b
Enjoying Shabbat while waiting to bury a relative: Berachot 18a Fasting, even temporarily, on Shabbat: Eruvin 41a
Enjoyment of Shabbat is important enough that it could override rabbinic decrees: Bava Metzia 54a
Honor of Shabbat - Kevod Shabbat
Note: The focus of Kevod Shabbat is in the preparations done before Shabbat.
Odd: Rashi uses the term "kevod shabbat" in describing a gemara's concern, even though the gemara invokes the biblical pasuk of oneg: Rashi Bava Metzia 54a s.v. "b'shabbat"
