A computing system helps a user in an extended reality (XR) learning experience achieve mastery through personalized, programmable and conversational coaching. One aspect is that the XR learning experience may consist of a plurality of tasks associated with the user. A second aspect is that the XR learning experience can define different types of conversational interventions triggered by the computing system at various times. A third aspect is that some tasks or interventions can make use of a conversational assistant. A fourth aspect is that as the user is going through the XR learning experience, the system determines which, if any, interventions can be triggered based on the user's state.