This next one is something of a deep dive: who's the other hope for the galaxy that Yoda mentions? Fans sometimes conflate this with Yoda's deathbed confession of the identity of Leia, when he tries to say "there is another Skywalker," a message clarified by Obi-Wan Kenobi. However, in Empire Strikes Back, a concerned Kenobi watches Luke blasting away from Dagobah and proclaims "That boy is our last hope," and Yoda replies "No, there is another."
It may seem cut and dry that Yoda is referring to Leia, but it really isn't. Remember, Obi-Wan knows about the existence of Leia, yet he didn't bother to oversee her or train her, and seems to discount her when he says Luke is their "last hope." It seems unlikely that Yoda, who has far less of a relationship with Leia and her family than Kenobi, would suddenly think she was a hope for the galaxy. The original screenplay for Empire Strikes Back, based on a story treatment by Lucas, also mentioned an entirely different twin sister for Luke. Later, Empire producer Gary Kurts told TheForce.net that Leia wasn't meant to be Luke's sister and they planned for Luke to meet this new character in a later film. Where does that leave us? Yoda's "there is another" remains ambiguous. Was it the original twin sister we'll never meet? Was it someone we already know? As with many Star Wars mysteries, Lucas' lips are sealed.