What is the explanation of the Hadith: "O young boy, say Bismillah, eat with your right hand, and eat from what is in front of you"?

The Hadith included the etiquette of eating and drinking that the Prophet, peace and blessings be upon him, guided Umar ibn Abi Salama to, which are: Bismillah (mentioning the name of Allah), eating with the right hand, and eating from what is directly in front of the eater.