1, concepts, axioms, theorems, etc. These are the foundations of learning mathematics. Without foundation, nothing can be done, just like how to hoe the ground without a hoe? Only by remembering it first can we understand it. If we all understand it, how can we apply it? For example: the property theorem of angular bisector, the distance from a point on the angular bisector to both sides of the angle is equal. This sentence is actually very simple. To put it bluntly, three conditions lead to a conclusion. But if you don't know and understand, how can you apply it? Needless to say, add auxiliary lines when encountering such problems. 2. Remember the math problem-solving methods. It is also very important to learn problem-solving methods in mathematics learning, because even with a hoe, you can't hoe the ground. But there are many ways to solve math problems, so we should know which one to use. Different methods should be adopted for different types, which is called "adapting to local conditions".