question #1 Sahih al-Bukhari 6561, Book 81, Hadith 150 : What is the significance of the least punishment in Hell as described in Islamic teachings?

I heard the Prophet (ﷺ) saying, “The person who will have the least punishment from amongst the Hell
Fire people on the Day of Resurrection, will be a man under whose arch of the feet a smoldering
ember will be placed so that his brain will boil because of it.”