In the first scene, we are introduced to the setting of the story: Verona, Italy. We also learn about the conflict between the Montagues and Capulets, two noble families who have been feuding for generations.
In the second scene, we meet Romeo and Juliet, the two main characters of the story. We learn that Romeo is a Montague and Juliet is a Capulet, which immediately sets up the potential for conflict.
In the third scene, we learn more about Romeo's character as he expresses his love for Rosaline. We also see how Juliet is affected by the conflict between her family and the Montagues when her cousin Tybalt confronts them.
These scenes provide the basic information needed to understand the story of Romeo and Juliet. The setting, characters, and conflict are all introduced, and the reader is left wondering what will happen next.