question #3 Sahih al-Bukhari 424, Book 8, Hadith 74 : What is the importance of following the Imam in congregational prayer?

The Prophet (ﷺ) came to my house and said, “Where do you like me to pray?” I pointed to a place. The
Prophet then said, “Allahu Akbar”, and we aligned behind him and he offered a two-rak`at prayer.