The main lesson that Obi-Wan learns was the more patient you are the more knowledgeable you will become. Obi-Wan learned this when he and his apprentice are dueling on Mustafar. For example, when Obi-Wan's apprentice did a hasty and impatient leap Obi-Wan cut of his legs. But if his apprentice was not hasty and impatient he might have not gotten his legs cut off. Also, his friend Luke reminded him of this lesson. Luke reminded Obi-Wan when Luke was fighting Darth Vader Luke was hasty and impatient like his father/ Obi-Wan's apprentice because Luke got his hand cut off. That is how Obi-Wan learned that lesson. I'd rate this book 9 out of 10. I would recommend this book to everybody because it is action packed and adventurous and has some humor too.