How Do I Learn Maths?

If i want to learn mathematics, how do i learn thematics? War so by doing your home work, doing class for follow your teacher a that's how you learn. And if i'm not understanding in mathematics, what is the way? So let's say, like, i'm a math teacher and a student, and i give a lecture for like an hour, and then i give the home work, and then the kid can't do the home work. What should i do next, is the teacher. Ask hwe why he doesn't understand what she doesn't understand? Which way? I mean, what part he doesn't he do she doesn't understands? Explain it more