Here is the introduction to the Positive Mitzvot of Shabbat. A short shiur to begin with.
Introduction
al capone bemidbar biodiversity Bnei Beteira Burning of the Talmud Chesed death ecology emily dickinson emor Evolution fats waller Hillel King David Limmud Malchut mashiach messiah Noah's Ark parsha Parshat Chukat Parshat Noach Pirkei Avot Rabbi Eliezer Rabbi Yehuda HaNasi rosh hashana sacrifices science Science and Judaism unetane tokef yom kippur yosef and his borthers