Yoda taught Obi-Wan. When and where he taught Obi-Wan is never established and it’s irrelevant anyway. Coruscant, midi-chlorians, none of that bullshit exists in the OT. What is known is that Obi-Wan taught Anakin, and they became friends. Anakin was then seduced by the dark side and became Darth Vader, the Emperor’s new apprentice.
Not that I’m disagreeing (because I completely agree that the PT has no authority over the OT which came first), but just to be nitpicky, Coruscant has been part of the canon since the beginning. The name is technically from the EU, it’s from the Thrawn trilogy I believe, but the Imperial capital / ex Republic capital, has been mentioned since the beginning. In some of the early drafts I believe it was even referred to as Utapau.
Alderaan said:
From there, Vader betrayed his fellow Jedi and helped the new Galactic Empire kill nearly all of them. Only Obi-Wan, Yoda, baby Luke and Leia remained. How the others were all killed, indeed how many were killed is never stated and also irrelevant to the Star Wars story. The only information that matters is that Obi-Wan took Luke and his aunt and uncle and went into hiding on Tatooine, Leia was taken to Alderaan, and Yoda lived on Dagobah. There is no hint that Yoda went into exile; rather, it always seemed to me that Dagobah was his home planet, and the reason he was never discovered was because Vader and the Emperor didn’t even know who he existed. In all of Vader’s dialogue in the OT, he mentions Obi-Wan’s name many times, but never says the name of Yoda even once. The only inference that can be made is that he (and therefore the Emperor) did not know who Yoda was.
In the novelization of ROTJ, which was offical canon, e.g. Lucas canon, not just EU canon, has Palpatine mention Yoda in a very vague way. After having asked Luke who finished his training he says; “There was one called… Yoda. An aged Master Jed…Ah, I see by your countenance that I have hit a chord…Yoda, then.” He even asks Luke if he’s still alive, so Yoda was never as important as he was made up to be in the PT.
Alderaan said:
The only explanation for why Luke Skywalker was able to live and grow up with Uncle Owen and Aunt Beru is that they too were in exile. Obi-Wan must have taken both of them with Luke into exile on Tatooine, and ordered them to raise the boy. It’s not possible in the OT for the Skywalkers to have come from Tatooine originally, otherwise Kenobi and Luke and his aunt/uncle would have all been found and destroyed.
Also your idea that Obi-Wan took Owen and Beru into hiding as well is a pretty interesting idea that I’ve never heard before. That could explain why Owen resents him so much. Tatooine isn’t exactly the nicest place in the galaxy.
However in the novelization of ROTJ, like I said before, technically Lucas canon, Owen is actually Obi-Wan’s brother.