We start from Prophet Adam alaihi salam. the first man.
When Allah wanted to create Adam, Allah informed the angels of that. The angels asked Allah the reason behind that.
Al baqarah 2: 30
And (remember) when your Lord said to the angels: “Verily, I am going to place (mankind) generations after generations on earth.” They said: “Will You place therein those who will make mischief therein and shed blood, – while we glorify You with praises and thanks and sanctify You.” He (Allâh) said: “I know that which you do not know.” (30)
Angels did not ask because they intend to disobey. Na’udzubillah. They ask to know and understand. Some scholars said, that previously there were another creation that brought destruction. Allah knows best. And indeed the angels are constantly glorifying Allah and praising Allah. But Allah informed the angels that He knows all things.
When Adam’s creation was completed, and Allah has breathed his soul into him, Allah commanded the angels and Iblis (who was residing in heaven) to prostrate to Adam.
Sad 38: 71-72
(Remember) when your Lord said to the angels: “Truly, I am going to create man from clay” (71) So when I have fashioned him and breathed into him (his) soul created by Me, then you fall down prostrate to him.” (72)
And as you know, the angels immediately responded to the command except Iblees.
Sad 38: 73-74
So the angels prostrated themselves, all of them: (73) Except Iblîs (Satan) he was proud and was one of the disbelievers. (74)
The Angels Taught Adam the Greetings of Islam
It is narrated that Abu Hurayrah said : the Messenger of Allah sallallahu alaihi waslaam said : “Allah created Adam in His image, and he was sixty cubit tall. When He had created Adam, Allah said, “Go and greet them – a group of angels who were sitting – and listen to how they respond, for that will be your greeting and the greeting of descendents, ” so he said, “Assalamu ‘alaikum”, and they said, “Assalamu ‘alaykum warahmatullahh.” So the angles added the word wa rahamatullah.
This is among the first thing that the angel taught mankind.
Some explanation of “Allah created Adam in His image”, Insya Allah
The angels washed Adam when he died
When Adam died, who would know how to wash his body. So the angels taught them.
Narrated by Ubayy that the prophet sallalahu alaihi wasalam said : “When Adam died, the angels washed his body with water an odd number of times, then they buried him in a grave with a lahd and said : this is the way of the sons of Adam.”
1. The World of the Noble Angels – Umar S. al Ashqar
2. Knowing the Angels – Muhammad al Jibaly