Where did the information come from for Moses to write Genesis since he was born generations beyond 'Adam'?<
This is not a hard question to answer. Enoch, the 7th generation from Adam, wrote a book called the Book of Enoch, from which a quote is taken by Jude, in his New Testament letter (Jude 1:14,15), who accurately portrays material from Genesis from the records kept of 'the faith once for all delivered to the saints' & which Jude was simply reminding them of 'that which they once knew.' Biblical people knew how to keep accurate records & passing them down.
Lamech, the father of Noah, only the 9th generation from Adam, was 65 years old when Adam died. Lamech, an adult man of 65 years old, would have been able to know & communicate with Adam, from whom he could get a direct account of the creation of the heavens & the earth. Lamech had the accurate, first hand source from the first & direct eye witness account of the historical narrative of the beginning of time & ancestry recorded in Scripure. Seth, the third son of Adam & Eve, knew Lamech & also knew Noah for 34 years & would be another accurate source for the book of Genesis, having learned it from his father & mother, Adam & Eve. Lamech was the son of Methusaleh, the oldest recorded person, who lived to be 969 years old.
Again, Methusaleh, only the 8th generation from Adam, who died the year of the worldwide global flood, would also be a reliable & accurate reporter. He knew Adam for 243 years and Seth for 355 years. Methusaleh knew Noah for 600 years & he was his grandson! He outlived his son, Lamech, by 5 years.
Just as the living Creator made a covenant with Adam & all living things, so God made a covenant with Noah & all living things after the global flood. (Gen 9:9,10) Accurate geneaologies were made before the flood & after the flood (Gen 10 & 11). Jewish people have kept accurate geneaologies & determine one's Israeli ancestry from them.
Eber, the great grandson of Shem, knew Shem & Noah & was able to obtain the accurate historical narrative of the contents of Genesis & the global flood from eye witness accounts, which Moses would later write down as a chronological historical narrative, from actual eye witness accounts. Eber outlived Abraham by 4 years!
Terah, the father of Abraham, also lived when Noah & Shem lived (Shem lived 502 years AFTER the flood) & had the ability to know & talk with them.
God made a covenant with Abraham, like He had made with Adam & Noah, concerning the historical narrative of God's plan of salvation after Adam & Eve sinned & passed sin & death to all mankind. This covenant was unconditional & centered on the one nation of all the nations that God chose to bring forth the promised Seed & Messiah, the Lord Jesus Christ. This unconditional covenant concerning the promised Seed, would become a blessing to all nations, covering all of time to the end of the age. Abraham knew Shem for 150 years & Noah died 2 years before Abraham was born.
This covenant was faithfully passed down to Abraham's son Isaac & his grandson, Jacob & God confirmed it both of them as well. Isaac knew Shem for 50 years. Jacob passed all this down to his 12 sons (tribes of Israel) & knew Abraham for 20 years.
Jacob's 3rd son, Levi, knew Isaac for about 45 years. Amran was his grandson & the father of Moses, who would have received all the historical information that had been passed down to him from the former patriarchs of Genesis historical record.
Moses was educated in the finest system in the world at that time trained by the ablest army of that time. He had access to the inner circle of the Pharoah's vast knowledge, some things of which our best scientists can't figure out today, such as the complex geological, physical & mathematical formula's used to build the pyramids of stones 2 to 50 tons each (2.3 million for Giza) & polished & flat to 1/100th of an inch. Egyptian paper, made from papyrus & pottery were mass-produced & exported throughout the Mediterranean basin, inventing a writing called hieroglyphs & a calendar based on 365 days & a number system based on 10, both of which we use in the modern world today.
Egypt had the famous Alexandrian Library. They were well advanced in ship building & navigation. In mummification, they knew what substances they needed to put on the skin — antibacterial, antifungal substances — to keep the skin best possibly preserved without having possible knowledge of any microbiological background.
Would Moses be qualified to write down the first five books of the Bible as assisted & commanded by God Himself? Would Moses had accurate & first hand knowledge of ancient historical narrative all the way back to Adam, that had been carefully passed down? The answers are definitely yes & yes.