Everyone says that concepts are crucial in mathematics. But how can we ensure that mathematical concepts are firmly established in students' minds? Will listening to the explanations of the nation's most famous "star instructors" help students understand the concepts well? Will repeatedly reading textbooks ensure a solid grasp of the concepts? Or will the concepts naturally take root in their minds simply by solving many workbooks? The answer was none of the above. Through my experience, I realized that concepts truly become the children's own only when they actively dive into problems that pique their interest, and when the concepts are reinvented and rediscovered within each individual's mind during the process of solving those problems. Mathematics must never be presented to children in an already abstract state. Children have no interest in the Pythagorean theorem, pi, or trigonometric functions. Presenting well-established mathematical definitions, theorems, and formulas before they even develop an interest is a shortcut to driving them to give up on math. Instead, when children draw mathematics from concrete real-life situations and discover that they can solve real-life problems through mathematical thinking, they truly understand the concepts and naturally develop an interest in higher-level mathematics. Consequently, their scores on the various school exams they must take immediately are bound to be good. This is because they understand the concepts more deeply than anyone else. To all my friends, let's start studying math again with the teacher and have a really fun time!