Permissibility of following the imaam from behind the door of the mosque

Ruling on woman being imaam for men

Should she pray behind her husband who is clean-shaven and lets his garment hang down below his ankles?

Ruling on leading the people in prayer with one’s head uncovered

 Ruling on praying behind someone who smokes cigarettes and the narghile

It is permissible for the imam to call the adhan, say the iqamah and lead the prayer

Ruling on praying behind someone who is praying alone

A woman walked in front of our row when we were praying in jamaa’ah

Ruling on a smoker leading prayers

Does there have to be one imaam and does he have to be the khateeb?