IIRC, the passing of the Tora/wisdom/divine knowledge in our tradition didn't start with Moses or even Abraham. Allegedly, the 19 generations of Tzadikim from Adam to Abraham studied/dealt with it passing the tradition over.
It appears, according to Judaism, that studying the Torah (whatever it is) and keeping the laws is the goal of the whole creation, and I'd expect the main sourcebook to focus on the existence and cultivation of that knowledge.
However, what we see in the plain text is that the only piece of the divine knowledge/Torah in the form of a Mitzvah/blessing explicitly passed on Adam is "be fruitful and multiply". (*I'm aware that the Gemmorah tries to find hints on Adam receiving the 7 Laws but the associations are very distant.*)
But instead, all G-d's interactions with Adam that are mentioned are very "Earthy" - "rule the animal kingdom", "take care of the garden", "multiply and don't eat fruits", "who told you you're naked", etc. Even when he's expelled G-d outlines his future physical suffering but no mentioning of studying, knowing or the like.
While I don't refute the existence of the Oral tradition, I see a need to justify the fact of omitting such important detail from the story.
So, assuming that studying Torah by men is the goal of the Creation, why the Torah does not mention any wisdom passed to Adam from Heaven?