It is not difficult to learn mathematics. My experience is: learn slowly. When you learn from the most basic knowledge, you should love a soldier like a child: what are its characteristics, what changes have you made, and what do you want to grasp? Never underestimate the ability of any insignificant soldier. Maybe it's because he helped you ruin everything. When the problem is in front of you, you can persevere and overcome difficulties. You can't just watch others think quickly.