The significance of the three strands of hair Galadriel gave to Gimli- a beautiful story. Please excuse the language. I almost didn't post due to the cussing. But it's just to nerdily beautiful not to post.
There's actually a book series (for kids) about it! I loved them! PotC was my first big fandom, just because I thought Captain Jack was such an amazing character! There's a ton of lit published by Disney about all the characters' back stories.