I’m starting over in my bible studies and have decided to be more thorough, educated, and honest in it after getting into the Ten Minute Bible Hour channel on YouTube. I got to Genesis 5 and saw a footnote mentioning something about verse 1 possibly referring to a written source that Moses used when writing, which conflicted with my earlier (albeit lazy) research for a school presentation that said oral tradition was the means of preserving text. So far I havent found anything useful to help me here, so I have to ask: how were genealogies kept before Moses finished writing? If you can cite a source so I can write it down in my notes, that would help too.
Also, sorry for asking this on the resting day. I just have a deep interest in these sorts of details both as a help for understanding the Bible and for general historical curiosity.