The Prophet’s ﷺ advice to Abu Hurayrah

My friend (the Prophet ﷺ ) advised me to observe three things: (1) to fast three days a month; (2) to pray two rakʿat of Duha prayer (forenoon prayer); and (3) to pray witr before sleeping.  

أَوْصَانِي خَلِيلِي ﷺ بِثَلاَثٍ صِيَامِ ثَلاَثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَرَكْعَتَىِ الضُّحَى وَأَنْ أُوتِرَ قَبْلَ أَنْ أَنَامَ