question #1 Sahih al-Bukhari 403, Book 8, Hadith 55 : What was the significance of the change in the Qibla direction for the Muslim community?

While the people were offering the Fajr prayer at Quba’ (near Medina), someone came to them and
said: “It has been revealed to Allah’s Messenger (ﷺ) tonight, and he has been ordered to pray facing the
Ka`ba.” So turn your faces to the Ka`ba. Those people were facing Sham (Jerusalem) so they turned
their faces towards Ka`ba (at Mecca).