Where is it written that women must cover their hair and what are the reasons that women must cover their hair. Is this a commandment?

is there a law against a jew entering a church. Please explain if i should not be attending a church wedding or some other religious occasion. How about if there is no occasion, just a girl scout meeting or such?

i love my husband very much and feel a lot of passion towards him. i was to have sex with him, but i dont want to have a baby yet. i love children but im not ready. does the torah prohibit haveing free sex.

What is the accepted psak regarding a woman speaking from the pulpit in a shul (a) on Shabbos morning following the end of davening, and (b) at a non-davening time. The pulpit is in front of the men's section, with the mechitzos and women's section on the sides.

Can you wear a self-winding watch on Shabbat?