Classroom management is a necessary condition for effective teaching. There are several key principles for good classroom management including: 1) being proactive and consistent with discipline to prevent problems, 2) establishing routines for daily tasks, 3) ensuring smooth transitions throughout the day, 4) balancing variety and challenge in student activities, 5) being aware of all classroom activities, 6) resolving minor issues before they escalate, and 7) reinforcing positive behavior. Effective classroom management allows teachers to make the most of instructional time and keep students engaged through a variety of challenging activities within clear routines and expectations.