Prophet Muhammad ﷺ (peace be upon him) instructed Abu Al-Darda to observe three practices which he himself never abandoned. He instructed him to fast three days every month, and not to sleep but after observing the Witr, and to observe supererogatory prayer in the forenoon while traveling and while resident. [Sunan Abi Dawud 1433]
DUHA PRAYERMorning prayers offered before noon are called Duha prayers. On account of his wife Ummul Momineen 'Aishah RA "The Messenger of Allah (ﷺ) used to perform 4 Rak'ah of Duha prayer (at the forenoon) and would add to them whatever Allah wished." [Riyadh as Salihin Book 9, Hadith 151] Another companion Anas RA reported he offered 6 Rak'ahs at another occasion . The prayer's format is 2 Ra'kahs followed by Salam and then as many sets of 2 Ra'kahs one wishes to pray. According to Sunnah, Prophet Muhammad ﷺ (peace be upon him) prayed 8 Ra'kahs in this manner on the day of the Conquest of Makkah .
FASTING 3 DAYS OF THE MONTHUmmul Momineen 'Aishah RA was asked which 3 days are most prescribed by Prophet Muhammad ﷺ (peace be upon him) for fasting. She mentioned that he fasted whenever suitable and there were no specific days prescribed rigidly as to when the 3 fasts should be kept . His fasting preference was the beginning/middle of the month and Friday was the least preferred day for fasting . The 3 days of Ayyām al-Bīḍ (White Days, the brightest of the Moon) 13th, 14th, and 15th (of the lunar dates) were preferred most in a month . Fasting for 3 days of the month carries reward equal to the fasting of a whole year . Mondays and Thursdays are also Sunnah favorite days for fasting .
Witr is an odd numbered prayer offered in the night, and according to Sunnah it could be 1 Ra'kah, 3 Ra'akah, or 5 Ra'akah . The Prophet performed 13 Ra'akah Witr and 7 when he grew old . Witr is to be offered before Fajr begins, and the Prophet advised Abu Hurairah RA to offer Witr before sleeping . He also expressed annoyance towards anyone who did not offer Witr.