When Hercules was born, Hera was very mad because Zeus had another baby with a woman and the woman was Hercules's mother. She was determined to kill Hercules
To get back at Hercules, Hera curses him to kill his wife and kids, but when he wakes up from "the curse" he finds his family dead on the floor and their blood on his hands
SInce Hercules killed his family, he has to do 12 tasks to repay for what he had done. his first tasks was to kill the lion that couldn't be killed by any weapon, and the second taks was to kill the 9 headed monster (Hydra)
FOr Hercules's sixth task, he had to drive away the Stymphalian birds which were a plague to the people of Symphylans, and for the ninth tasks Hercules's had to get the artifact from Queen Hippolyta, but when her soldiers attacked him, he killed the Queen and stole the artifact.
FOr Hercules's second to the last task, he had to get He had to get the golden apples of Hesperides, so he traded places with Atlas, and allowed him to get the apples
FOr Hercules's final task he had to kill the three-headed dog Cerberus, and he also freed his friend Thebeus