Second, the basic formula should be memorized. Including chord length formula, midpoint chord length formula and its derivative, focal radius formula, distance formula from point to straight line, etc.
Third, we should master the basic methods. Such as the simplification of simultaneous equations of straight lines and ellipses, the application and arrangement of chord length formula, and the vector method of perpendicular two straight lines.
Fourth, the summary of the basic problems. For example, the problem of a straight line passing through a fixed point, the problem of finding a straight line equation, and the problem of finding the maximum area of a closed figure.
Practice more on moderately difficult questions, and some comprehensive questions require a lot of calculation, so be patient and step by step.