Read hadith and know hadith to yourself
Bismillahir rahmaanir raheem
Narrated ‘Abdullah bin ‘Umar : The Prophet said , “Night prayer is offered as two Rakat followed by two Rakat and so on ,and if you want to finish it , pray only one Raka which will be Witr for all the previous Rakat .”Al-Qasim said , “Since we attained the age of puberty we have seen some people offering a three-Rakat prayer as Witr and all that is permissible . I hope there will be no harm in it .”
Narrated ‘Aisha (R) : Allah’s Apostle (S) used to pray eleven Rakat at night and that was his night prayer and each of his prostrations lasted for a period enough for one of you to recite fifty verses before Allah’s Apostle raised his head . He also used to pray two Rakat before the Fajr prayer and then lie down on his right side till the Muadh-dhin came to him for the prayer .