To find key points of a book in general:
*Carefully follow the plot, setting, main characters, theme, and conflicts arising within the book to see if they remain consistent, or if there are any unexpected (setting) shifts, (plot, theme, or main character) developments, or (plot or conflict) twists within the book's storyline in that literary regard.
*Once you find exactly where, when, how, why, and under whom different important moments in a book's storyline occur throughout the overall context, make note of them mentally and in writing so that you can keep them in your notes and in the back of your heard for near-future literary correlations as you continue reading the book from cover to cover.
*Also, if there are any points/moments that stand out to you specifically as you read along, make note of them and include them in your written summary/book report accordingly, in addition to explaining how and why those given points/moments stand out to you.
I hope this helps! Good luck with your project, Amen!