After you he finish fighting and conquering the Minyans and the citizen reward him by marring the princess.
When he had to play for what he did so he had 8 task. I picked the the second labor which is he had to killed the nine headed creature that was call hydra and it lives in the swamp. This was kind of a hard task because any time you killed the hydra they grow more heads.
In the text it state that Hera was jealous of Hercules because it wasn't her son so she mad him crazy and he killed his wife and his children . so the test was to protect the city and he had t do 12 task.