What is the First Quarter about in The Crossover Book by Kwame Alexander?

In the book "The Crossover" by Kwame Alexander, the First Quarter refers to the first part of the story. It introduces the main characters, 12-year-old twins Josh and Jordan Bell, who are both talented basketball players. The First Quarter focuses on their close relationship and their passion for basketball. The story revolves around their experiences, interactions with friends and family, and their dedication to the game. However, Jordan starts noticing changes in their relationship when Josh begins to spend more time with a new friend, instead of being focused on their basketball dreams together. The First Quarter sets the stage for the conflicts and challenges that the characters will face in the following quarters of the book.