The document describes how the idea of a good friend changes as one progresses through different grades in school. In early grades, a good friend was someone who shared toys or helped stand up to bullies. In middle school, good friends helped each other through social challenges like dances and parties. In high school, good friends provided emotional support during breakups and helped each other prepare for life after graduation. Now, the document says a good friend is someone who supports you by giving better options, helping when scared, making time for you, helping improve oneself, and most importantly loving you.