Opening The Right Door
/start is the front door. In DM it gives you the personal start panel; in groups it keeps things short and points people toward the panels they need.
/help opens the in-chat index, while /games opens the game shelf. Use those when you are already inside Telegram and want buttons instead of a long web page.
/pulse is the little heartbeat check. If the group feels like Iris is slow, it tells you whether she is alive and responding.
/handbook and /arcana open DM web panels when those apps are available for Iris.
Good first flow: start Iris in DM, add her to the group, then use /help in the group so members can discover what fits them.