Basically it is all about the decisions that teenagers have to make about their future. They all get summer jobs at Lava Springs, a club that Sharpay and Ryan's dad owns.
Because Sharpay is in love with Troy she gets the manager of Lava Springs to give him a promotion and Troy starts to see less and less of Gabriella. Then Troy gets a chance to train with the Red Hawks, a top basketball team. He decides to take the chance and train with them. But soon Gabriella starts to wonder why he is being so distant and quits her job at Lava Springs, then Troy has to decided between basketball and Gabriella and his friends.
In the end Sharpay decides that there may be people better than her.