1 Enoch, 2 Enoch, 3 Enoch, Jubilees, and related texts encode: heavenly temple journeys, hidden books of wisdom, angelic gatekeepers, pre-Flood science. These are a core background for both Kabbalah and Hermetic myth-making, and they feed directly into the Hermes–Enoch synthesis and the “lost pillars” story.
It also discusses the teaching of humans by the fallen angels, chiefly Azâzêl:
And Azâzêl taught men to make swords, and knives, and shields, and breastplates, and made known to them the metals of the earth and the art of working them, and bracelets, and ornaments, and the use of antimony, and the beautifying of the eyelids, and all kinds of costly stones, and all colouring tinctures. And there arose much godlessness, and they committed fornication, and they were led astray, and became corrupt in all their ways. Semjâzâ taught enchantments, and root-cuttings, Armârôs the resolving of enchantments, Barâqîjâl, taught astrology, Kôkabêl the constellations, Ezêqêêl the knowledge of the clouds, Araqiêl the signs of the earth, Shamsiêl the signs of the sun, and Sariêl the course of the moon.
God commands Raphael to imprison Azâzêl:
[T]he Lord said to Raphael: "Bind Azâzêl hand and foot, and cast him into the darkness: And make an opening in the desert, which is in Dûdâêl (God's kettle / crucible / cauldron), and cast him therein. And place upon him rough and jagged rocks, and cover him with darkness, and let him abide there for ever, and cover his face that he may not see light. And on the day of the great judgement he shall be cast into the fire. And heal the earth which the angels have corrupted, and proclaim the healing of the earth, that they may heal the plague, and that all the children of men may not perish through all the secret things that the Watchers have disclosed and have taught their sons. And the whole earth has been corrupted through the works that were taught by Azâzêl: To him ascribe all sin."
God gave Gabriel instructions concerning the Nephilim and the imprisonment of the fallen angels:
And to Gabriel said the Lord: "Proceed against the biters and the reprobates, and against the children of fornication: and destroy [the children of fornication and] the children of the Watchers from amongst men [and cause them to go forth]: send them one against the other that they may destroy each other in battle ..."
The Lord commands Michael to bind the fallen angels.
And the Lord said unto Michael: "Go, bind Semjâzâ and his associates who have united themselves with women so as to have defiled themselves with them in all their uncleanness. 12. And when their sons have slain one another, and they have seen the destruction of their beloved ones, bind them fast for seventy generations in the valleys of the earth, till the day of their judgement and of their consummation, till the judgement that is for ever and ever is consummated. 13. In those days they shall be led off to the abyss of fire: (and) to the torment and the prison in which they shall be confined for ever. And whosoever shall be condemned and destroyed will from thenceforth be bound together with them to the end of all generations. ..."