Making the last prostration of the prayer lengthy for the purpose of offering supplication

What is the supplication that the Prophet (blessings and peace of Allah be upon him) learned from Allah, may He be exalted?

It is not permissible to pray against oneself asking that one be cursed, even if it is conditional

Her friend asked her to pray for her to have a baby girl

Ruling on offering supplication for one who forwards a video or who gives charity and says: This is charity on behalf of everyone who forwards the video