Classroom management relies on establishing rules, routines, and positive teacher-student interactions to create an orderly learning environment. Effective strategies include modeling polite behavior, developing classroom rules with student input, praising good behavior, addressing issues immediately but privately, and keeping things positive. For online learning, the teacher needs to build engagement, community, clearly organize resources, establish participation norms, and routinely contact and support students. Without good classroom management, teaching goals are difficult to achieve.