^Did we ever learn what the third lesson was off-screen? I’ve read the novelization and such but I can’t remember
The “third lesson” was that scene in the TLJ novelization (it was in the deleted scenes too) where Luke claims that the Caretaker village is being invaded by pirates. He tells Rey that a true Jedi wouldn’t save them, but Rey runs off anyway. Once she gets there, she finds that it was actually a big party all along. Luke tells her that it was supposed to be a lesson on how Jedi beliefs don’t matter anymore, but Rey gets pissed and storms away.
Some fan edits have added that scene back into the movie, but Hal’s didn’t, so Cinefy’s idea was supposed to be another way of incorporating a third lesson into the trilogy.