question #1 Sahih al-Bukhari 1999, Book 30, Hadith 104 : What is the significance of fasting for those performing Hajj-at-Tamattu` if they cannot afford a Hadi?

Fasting for those who perform ,Hajj-at-Tamattu` (in lieu of the Hadi which they cannot afford) may be
performed up to the day of `Arafat. And if one does not get a Hadi and has not fasted (before the `Id)
then one should fast of the days of Mina. (11, 12 and 13th of Dhul Hajja).