Is the writing effective?

Most parts of the book, were effective and easy to understand. All the characters dialogues, except Archie’s were understandable. Also, the author’s way of describing the characters were also  to understand. There were parts that were really interesting. An example is when Stargirl stalks people in fifteen minutes to learn about the person’s life. After that, she would make a card for that person to cheer him or her. However, there were some parts that were hard to understand. There were instances when dialogues were not properly explained in the book.  When Leo consulted Archie for advice, Archie’s lines were figurative. The message of Archie was not explained in the book.