One, luke is a twilight Jedi, he went Jedi/ Sith/ then back to Jedi order. So Luke has a very deep understanding of the force and it's rules. 2 Luke left the rebels after Vader, looking for more Jedi to rebuild the order and maintain peace in the galaxies. 3 go online or to a library and read the books people wrote for Star wars which are considered canon, enrich y'all's mind.