Due to the space limitations of a text message, please note that it is particularly important to read carefully, pay close attention to the context of the question, and use the answers as a springboard for further study.
Q: Why do u wait to say havdalah AFTER the megillah this Saturday night?
A: To demonstrate our affection for Shabbos, we delay our official farewell as long as possible.
Q: Does one have to re-fast if he broke his fast?
A: One who forgets it’s a fast day and breaks their fast should fast for the rest of the day but doesn’t have to make it up. (Mishnah Berurah 568:8)
Q: Who is truly obligated to fast?
A: On the fast of Esther, all healthy people who are feeling normal are required to fast; someone who is sick or has a headache does not need to fast.
Q: Where can I buy Tilapia in Phoenix?
A: You can either get frozen Tilapia fillets in the kosher stores or for fresh have a fish store or counter show you the scales before they cut it (then thoroughly scrub and wash it afterwards). You may be able to find a wholesale store that carries cases of frozen fillets with a hechsher. There are some bags of frozen fillets available that have a hechsher that is not recommended.
Q: Where does the daled knot go on a lefty’s’ shel yad tefillin???
A: A lefty’s tefillin knot goes on the inside of arm (the mirror image of righty tefillin); the Talmud says it should be near the heart. Regarding the little yud shaped knot that is formed by the tip of the tefillin end of the strap, some (including the Steipler who was a lefty) say that it is also a mirror image of righty tefillin, while most tie it in the identical direction of the righty version (with its tail pointing towards the tefillin).
Q: Can an avel (someone in mourning) attend a Purim seudah?
A: The widespread practice is for an aveil to make the Purim seudah in his home, however there is legitimate basis to permit participation even outside the home without reservation.
Q: Is the halacha of attendance at the Phoenix community Purim breakfast the same as attendance an a Purim seduah (for an avel)?