What are the lessons of each canto? and what do you think will be lesson for the upcoming ones? (spoiler tagged just in case)

Now it would seem really obvious to some of you what they are but I really only have an idea of Ishmael's, Don's and Yi sang's and even then I can't really put them to words as a complete idea.

So please help me figure them out and what you think is the lesson for the upcoming ones because I am writing something... and their ... and I really need them...

Any ideas is accepted.