question #1 Sahih al-Bukhari 397, Book 8, Hadith 48 : What is the significance of praying inside the Ka`ba according to Islamic tradition?

Someone came to Ibn `Umar and said, “Here is Allah’s Messenger (ﷺ) entering the Ka`ba.” Ibn `Umar said,
“I went there but the Prophet (ﷺ) had come out of the Ka`ba and I found Bilal standing between its two
doors. I asked Bilal, ‘Did the Prophet (ﷺ) pray in the Ka`ba?’ Bilal replied, ‘Yes, he prayed two rak`at
between the two pillars which are to your left on entering the Ka`ba. Then Allah’s Messenger (ﷺ) came out
and offered a two-rak`at prayer facing the Ka`ba.’ ”