LOL no need to be alarmed, Lady here is how it came about according to our tradition:
https://islamqa.info/en/10012
Excerpt for full go to source please:
"The Qur’aan was revealed to the Prophet (peace and blessings of Allaah be upon him) in stages over a period of twenty-three years. Allaah says (interpretation of the meaning):
“And (it is) a Qur’aan which We have divided (into parts), in order that you might recite it to men at intervals. And We have revealed it by stages”
[al-Isra’ 17:106]
al-Sa’di (may Allaah have mercy on him) said:
This means, We have revealed this Qur’aan in stages, to differentiate between guidance and misguidance, between truth and falsehood.
“
in order that you might recite it to men at intervals” means, slowly, so that they may ponder and think about its meanings, and understand the different branches of knowledge contained therein.
“
And We have revealed it by stages” means, gradually, over a period of twenty-three years.
Tafseer al-Sa’di, p. 760.
Secondly:
Literacy was not widespread among the Arabs. Allaah described them in such terms when He said (interpretation of the meaning):
“He it is Who sent among the unlettered ones a Messenger (Muhammad) from among themselves”
[al-Jumu’ah 63:2]
They used to memorize the Qur’aan by heart, and a few of them used to write down some verses or soorahs on animal skins, thin white stones and the like.
Thirdly:
At first the Prophet (peace and blessings of Allaah be upon him) forbade the writing of anything other than the Qur’aan, and he forbade them to write down his words for a while, so that the Sahaabah would focus on memorizing the Qur’aan and writing it down, and so that the words of the Prophet (peace and blessings of Allaah be upon him) would not be confused with the words of Allaah, and so the Qur’aan was protected from anything being added or taken away.
Fourthly:
The Prophet (peace and blessings of Allaah be upon him) appointed a group of his companions who were trustworthy and knowledgeable to write down the revelation. They are known in their biographies as those who wrote down the Revelation, such as the four Caliphs, ‘Abd-Allaah ibn ‘Amr ibn al-‘Aas, Mu’aawiyah ibn Abi Sufyaan, Zayd ibn Thaabit and others – may Allaah be pleased with them all.
Fifthly:
The Qur’aan was revealed in seven dialects as was narrated in the saheeh hadeeth of ‘Umar ibn al-Khattaab (may Allaah be pleased with him) from the Prophet (peace and blessings of Allaah be upon him). This was narrated by al-Bukhaari (2287) and Muslim (818); these were the dialects of the Arabs which were known for their eloquence.
Sixthly:
The Qur’aan continued to be preserved in the hearts of the Sahaabah who had memorized it, and on the skins and other materials until the time of the caliph Abu Bakr al-Siddeeq (may Allaah be pleased with him). During the Riddah wars many of the Sahaabah who had memorized the Qur’aan were killed, and Abu Bakr (may Allaah be pleased with him) was afraid that the Qur’aan would be lost. So he consulted the senior Sahaabah about compiling the Qur’aan in a single book so that it would remain preserved and would not be lost. He entrusted this mission to the chief of memorizers Zayd ibn Thaabit (may Allaah be pleased with him). Al-Bukhaari narrated in his
Saheeh (4986) that Zayd ibn Thaabit (may Allaah be pleased with him)