Canon refers to all the information arising from the original, or officially sanctioned, material.
In Young Hercules, in addition to the TV Show canon covers material in the
- Young Hercules (Movie Pilot)
- Hercules the Legendary Journeys flashbacks episodes
- Young Hercules novels: Young Hercules (Novelization), Cheiron's Warriors, The Ares Alliance, and Mission From Zeus
The notion of what comprises the canon is subjective, and both fans and the creators of a body of material will have differing opinions on the topic. On this site, canon from sources other than the TV Show contains a superscript tag to indicate its source, so readers can ascribe their own hierarchy or value to the information.