For a walled city, is the Shabbat boundary measured from the wall or from the inhabited structures, depending on whether habitation preceded or followed enclosure?

May one wear a properly valid tallit (with all four valid tzitzit) in the public domain on Shabbat, whether a small or large tallit?

When to Wear Tzitzit

Is construction kablanut permitted when the work site is outside the techum (Shabbat boundary) of the Jew's city?

Work Restrictions on Erev Shabbat

If a Jew rents oxen to a non-Jew to plow with them, and the non-Jew does plow on Shabbat — what determines whether the animals are still considered 'the Jew's' for purposes of shiviyas behemah?

Shabbat Candle Materials

If there is an established postal agent (beit dvar) in the destination city, may one send a letter on erev Shabbat without specifying a fee?

Adjusting the Candle on Shabbat

Is it permitted to repair a friend's clothing for Shabbat on Erev Shabbat, and does it matter whether one accepts payment?

Bathing Before Shabbat

Once a fire meets the required threshold before Shabbat, may one use it on Shabbat regardless of whether it is on the ground or on a stand, and regardless of whether it was made from materials not valid as Shabbat lamp wicks?

Hatmanah — Insulating Limits