Katniss and her best friend Peeta got hunting to take care of their family. Hunting and going beyond the fence is illegal. There are no cameras past that area. This is why Katniss sometimes hangs out and jokes around with Peeta about the rules of the Capitol.
At the reaping Katniss's little sister Prim was picked as the female tribute to fight to the death in The Hunger Games. Katniss then volunteered as the tribute in order to save her sister. The male tribute was chosen and he happened to be Peeta. A boy who in her childhood saved her from starvation by throwing her a piece of bread.
The two tributes were taken to the Capitol to be presented, interviewed and prepared for The Hunger Games. They were dressed up and mentored then, they were thrown into the Games.
As people are dying, Katniss is chased up a tree where she meets Rue in another one not so far away. Rue points out the deadly Tracker Jaker hive which Katniss cuts down on top of the Career group that was trying to kill her. She gained a bow and arrows from a tribute who died from the attack. After this Rue and Katniss become allys.
Eventually, Rue dies due to a spear from the district 1 boy. Katniss killed him and sang to Rue, covering her body in flowers. Claudius announces that two tributes can win if they are from the same district. Katniss then finds Peeta badly injured and nurses him back to health and falling in love with him for the sake of their survival. Cato is the only tribute left besides them. They go out looking for him finding that he had been running from mutated wolves. Cato is then killed. But, the rules changed now there can only be one winner. Katniss and Peeta can't decide who should go home. So, they both decide to kill themselves. Claudius stoped them just in time and announced both of them the winners.
Katniss and Peeta have won but now, the head of the Game makers is mad because of that stunt. So, Katniss plays the innocent role and says it was out of love. However, it was just her outsmarting the Game makers. In the end, it works out and both Peeta and Katniss get to go home.