"In Islam, there is no concept of "fallen" angels, as it is in the nature of angels to be faithful servants of Allah. They have no free choice, and hence no ability to disobey God"
https://www.learnreligions.com/angels-in-islam-2004030
"The center of contention emanates from the Old Testament in Genesis Chapter 6 verses 1–4: “When human beings began to increase in number on the earth and daughters were born to them, the sons of God saw that the daughters of humans were beautiful, and they married any of them they chose” (Vv. 1–2)."
https://www.biblekeeper.com/sons-of-god/
"The first ruler formulated a plan with his powers. He sent his angels to the human daughters so they might take some of them and raise offspring for their pleasure. At first they were unsuccessful. When they had proved unsuccessful, they met again and devised another plan. They created a contemptible spirit similar to the spirit that had descended, in order to adulterate souls through this spirit. The angels changed their appearance to look like the partners of these women and filled the women with the spirit of darkness that they had concocted, and with evil.
They brought gold, silver, gifts, copper, iron, metal, and all sorts of things. They brought great anxieties to the people who followed them, leading them astray with many deceptions. These people grew old without experiencing pleasure and died without finding truth or knowing the god of truth. In this way all creation was forever enslaved, from the beginning of the world until the present day.
The angels took women, and from the darkness they produced children similar to their spirit. They closed their minds and became stubborn through the stubbornness of the contemptible spirit until the present day."
http://www.gnosis.org/naghamm/apocjn-meyer.html
"Two hundred of the ‘fallen angels’ descended from the heavenly realm on to the summit of Mount Hermon and they were so smitten by the beauty of human women that, using their new material bodies, they had sex with them. This further incurred Yahweh’s wrath and, according to the Bible, the consequence of this miscegenation between the Fallen Ones and mortals led to the creation of half-angelic, half-human offspring (Genesis 6:4).
These children were called the Nefelim or Nephilim and they were the giant race that once inhabited Old Earth. The fallen angels taught their wives and children a variety of new technological skills, magical knowledge and occult wisdom. This suggests that psychic abilities and magical powers were originally an ancient inheritance from the angelic realm given to early humans."
"He taught men to forge swords and make shields and breastplates (body armour). Azazel also taught them metallurgy and how to mine from the earth and use different metals. To the women he taught the art of making bracelets, ornaments, rings and necklaces from precious metals and stones. He also showed them how to ‘beautify their eyelids’ with kohl and the use of cosmetic tricks to attract and seduce the opposite sex. From these practices Enoch says there came much ‘godlessness’ and men and women committed fornication, were led astray and became corrupt in their ways.
This was the basis for the early Church condemning the fallen angels for teaching women to make necklaces from pieces of gold and bracelets for their arms."
"The fallen angel Shemyaza, another form of Azazel, is said by Enoch to have taught humans the use of root cuttings and the magical art of enchantment; the fallen angel Armaros taught the resolving (banishing) of enchantments; Baraqijal taught astrology; Kokabiel, the knowledge of the constellations (astronomy); Chazaqiel, the knowledge of the clouds and the sky (weather lore and divination); Shamsiel, the signs of the sun (the solar mysteries); Sariel the courses of the moon (the lunar cycles used in horticulture and agriculture and the esoteric lunar mysteries); Penemuel instructed humans in the art of writing and reading; and Kashdejan taught the diagnosis and healing of diseases and the science of medicine."
https://www.newdawnmagazine.com/articles/enoch-the-watchers-the-real-story-of-angels-demons