The word Qur'an means "recitation", the Qur'an was not intended as a book. I'll go over the basics here.
A verse would be revealed to Muhammad ص
He would recite it, and teach it to his companions
He had several scribes, he would have them write it, to teach other people
When Muhammad ص died, the Qur'an was written, probably a few times over on these fragments. During the first caliph, Abu Bakr's reign, he tasked after the battle of Yamamah in which many Haafiz (people who fully memorized the Qur'an) died, Zayd ibn Thaabit with collecting all those fragments from the scribes, and each fragment needed two credible witnesses to authenticate it was indeed written on the command of the prophet.
This is how the first codex of the Qur'an was compiled.
Uthman, later standardized the harf into the original Qurayshi harf (there were six others, in six other dialects revealed to Muhammad ص). He did this because in foreign lands they would argue over who has the correct version, even though both were correct, to clear up confusion, the original harf was distributed to the conquered provinces.
And that's really the end of the story as simplified as I could make it.
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