question #2 Sahih al-Bukhari 37, Book 2, Hadith 30 : How does sincerity in worship during Ramadan affect the forgiveness of past sins?

Allah’s Messenger (ﷺ) said: “Whoever establishes prayers during the nights
of Ramadan faithfully out of sincere faith and hoping to attain
Allah’s rewards (not for showing off), all his past sins will be
forgiven.”