There are many kinds, but elementary mathematics needs to master trigonometric function, power function, exponential function, inverse trigonometric function and logarithmic function. I don't know what stage you have learned, but all the above are necessary for high school. There are also many curve functions (quadratic and cubic functions, hyperbola, circle, ellipse, parabola) and linear functions, and these images are also to be mastered in junior and senior high schools.