In the annals of Star Wars history, many fans consider Luke Skywalker's most formative relationship to be the one he forged with Ben Kenobi. He didn't fully know the story about Obi-Wan and his dad Anakin, which led him to believe in Ben unconditionally -- but even after the truth came out their bond remained strong, which was why the former Jedi Master often appeared as a ghost or spoke to Luke through the Force.
Source：https://www.cbr.com/the-book-of-boba-fett-luke-mentor-wasnt-obi-wan/
