Thank you for using the Jiskha Homework Help. Here are several sites where you can research that question:
3. (the poem that caused the title): http://www.wsu.edu/~brians/anglophone/achebe.html
6. (a lesson plan): http://edsitement.neh.gov/view_lesson_plan.asp?id=382
Okonkwo was a very angry man during the entire book. You need to go back to each mention of his father and then watch his actions to get the whole picture.