A great summary of Kai Bird's book, which is highly recommended!
A really interesting thing to note about Oppenheimer, as the author points out, was a somewhat "haphazard" approach both to studying physics, and in his actual scientific work. Meaning, picking the problems he found the most interesting, rather than some grand, overarching idea.
It's always fascinating in reading books of this sort to see just how closely knit the physics community was, since Oppenheimer studied with Born and Thomson, met Bohr as a student, and later worked with a lot of the truly great ones. Even in the macabre poisoning episode, the tutor he left the apple for was Patrick Blackett, a future Nobel laureate.