Here’s where Luke learned the Jedi teachings.
Darth Vader #10 by writer Charles Soule and artist Giuseppe Camuncoli reveals where Luke Skywalker got what he needed to start his Jedi Academy after the events of Return of the Jedi.
Warning: full spoilers for Darth Vader #10 ahead!
Taking place shortly after the events of Revenge of the Sith, the story arc “The Dying Light” that began in Darth Vader #7 saw Jocasta Nu, Chief Librarian of the Jedi Archives, hidden away on an unknown planet with her assistant Gar. There, she spent her days recording everything she could remember about the Jedi Order onto holocrons, filling up an entire bookshelf full of them.
Jocasta knows that her old age is catching up with her and wants to make sure all of her knowledge survives her eventual passing. Her ultimate goal is to start a school for new Jedi, although to do that, she needs students, so she goes on a mission to the Jedi Temple on Coruscant to retrieve from the archives a list of Force-sensitive children that were going to be sought out for Jedi training – before Order 66, that is. She successfully retrieves the list on a chip, but is captured by Darth Vader, who reads the list* and destroys the chip. Even though her death isn’t shown, it is strongly implied that Vader kills Jocasta rather than bring her to the Emperor as he had been commanded.
Back at Jocasta’s would-be school, Gar is seen living a life of solitude, clearly upset that Jocasta never returned. Before she departed, he expressed his desire to be with her so they could live a happy life during their remaining years, but she was adamant about using her remaining time to do what she could to help restore the Jedi, even if that happened after her time was done. Gar eventually decides to set off an explosive that seals the entrance to the hideout, killing himself in the process. A great deal of time is implied to have passed, and then we see Luke Skywalker digging through the rubble.
It looks as though sometime after Return of the Jedi Luke was able to track down the location of Jocasta’s hideout. Upon exploring it, he essentially had everything he needed to start his own Jedi Academy. It’s doubtful that the hideout was used as his school given that it’s a cave underneath a waterfall, which doesn’t match the setting seen in the flashbacks to his Jedi Academy during The Force Awakens and The Last Jedi, but it’s safe to assume he used Jocasta’s holocrons as the basis for his teachings to the next generation of Jedi… before Ben Solo was turned to the Dark Side and murdered them.
*On Twitter, Star Wars Explained translated the list of names of Force-sensitive children viewed from inside Darth Vader’s helmet.
From Darth Vader 10. All new names as far as I can tell.
Darien Whit, Alderaan Scape Loewig, Cathar Devin Hvitur, Bespin Alaytia Taverre, Kessel Kris Elioup, Eadu Annali Bissa, Corellia Nik Lowe, Mustafar Jacque Porte, D’Qar pic.twitter.com/e7sIhiVHba
— Star Wars Explained (@StarWarsExplain) January 10, 2018
Funny enough, “Nik Lowe” is a nod to Marvel editor Nick Lowe.