I am a junior three student. If you really can't adapt to this kind of teacher's way, I suggest you attend a cram school after class, or buy extracurricular tutoring books that you can understand. Some counseling books have very detailed analysis, such as a complete interpretation. The absolute value should be easy to understand. It doesn't matter, you're just a junior high school student. If you have time, you'd better tell an example that you don't understand.