Did the Prophet learn from someone to write the Qur’an?

1. Waraqa ibn Nawfal was a cousin of Khadija (rah). Prophet married Khadija at the age of 25. Is there any report that shows us the prophet knew waraka ibn nawfal from before the time of their marriage? Then how can it be possible that Waraqa ibn Nawfal taught the prophet for 40 years?

Just for a moment, we Suppose Nawfal was the mentor of the prophet for 25 years, he taught the prophet about the Bible. Now Question arises why there is many and major differences between the Quran and the Bible? Why and how prophet didn’t add the errors of the bible in the Quran?

2. There are around 75 thousand words in the Quran, These are approximately six or six and a half thousand verses.

You tell us to believe that a human can memorize a book of this size without knowing writing or without making any copy of this book?

This is too much for something to ask to believe.

Moreover, every verse in the Qur'an was related in some way to the situation of that moment when it was revealed. Then how is it possible for a human to make a book without writing or making any copy and memorize the whole book during his early life that fits or fits so much into the future situation?

It is possible to prove in many ways that the Qur'an came from Allah. Here is one of them, You can check it out - https://www.frommuslims.com/qna/কোরআনের-চ্যালেন্জ/