So Rey has all of the remaining Jedi teachings in the books. She showed in TLJ she wasn't afraid to look into the dark side in that cave scene. She was a salavager in TFA, going into the star destroyer. So maybe she goes looking for the equivalent teachings from the dark side in the wreckage of the old death star, and finds a holocron. I thought that's what it looked like she was surveying in one scene of that teaser.
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"Cammy just threw them in my locker & told me to hold on to them." - Giordano on the pencils from Iggy's stall. 
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