What are the specific rules and guidelines for the Commander Zone in the game of Magic: The Gathering?

In Magic: The Gathering, the Commander Zone is where your commander card stays when it's not on the battlefield. You can cast your commander from the Commander Zone, and if it would go to any other zone, like your hand or graveyard, you can choose to put it back in the Commander Zone instead. You can look at your commander at any time, and other players can't.