Ruling on praying behind someone who is praying alone

Ruling on a smoker leading prayers

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

Who has the most right to lead the prayers?

Should the imam appoint someone to take his place if his prayer becomes invalid?

An imam is guilty of some secret sin; should he continue in his position as imam?

If the one who knows more Qur’an holds Ash’ari beliefs, can he still lead the prayer?

Can a woman lead prayer if she knows more Qur’aan?

Adding another rak’ah to the imam’s witr because one wants to pray some more

He joined the congregation to pray Maghrib, and did not realize that the imaam was praying ‘Ishaa’