The result of point multiplication is a scalar;
A b = | a || b | cosw (There are vector marks on A and B, which is not convenient for typing. W is the angle of two vectors).
The result of the cross product "×" is a vector perpendicular to the plane formed by the original vector.
A×B=|A||B|sinW
You can refer to Advanced Mathematics, which is required by general engineering universities! !