rabbi, three quick shabbos and havdalah questions.

1. shabbos candles: is the mitzva only for women? if a man lives alone, is he obligated to light, and does he make the bracha? and if a man lights, single, widower, or his wife is away, does he light two candles like the usual custom? is the preference that a woman lights a real halachic preference, or just how the custom developed?

2. havdalah without a candle: if a person has wine but no candle motzei shabbos, traveling or somewhere fire is not allowed, is the bracha on the fire me’akev? does an electric light or a flashlight count for borei meorei ha’eish? and if no fire is available at all, can havdalah wait, and until when?

3. havdalah before melacha: the shulchan aruch (orach chayim 299:10) forbids any work before havdalah, and says saying “hamavdil” without a bracha is enough to permit work. but shabbos already ended at tzeis by the clock, so what is havdalah adding? does it end shabbos or only permit melacha? and does ata chonantanu in maariv count for this?

bottom line, basically: where does the common practice end and the actual halacha begin?