Sunnah : Fast for the first 9 days of Dhul-Hijjah.
Remember that Allah has said in a hadith qudsi, Allah has said: “All the deeds of the son of Adam are for him, except fasting, which is for Me and I shall reward for it.”
To earn the pleasure of Allah even more, we can encourage our friends and family to fast by arranging to break the fast together. That way we will have earned the reward for fasting ourselves, as well as the reward of all the other people who fasted because of us, and the reward for feeding a fasting person!
SubhanAllah, and in these blessed days, we can’t miss out.