First of all, we should lay a good foundation for hard pen calligraphy, and then go to the calligraphy improvement class, aiming at students with better basic skills. Hard-pen calligraphy is the basis of learning calligraphy, which requires high understanding. Any study needs direction.
What is wrong in calligraphy class is not necessarily right. But if you don't take calligraphy classes, have no guidance, and have no foundation, it's still quite mysterious.