How to use cross product to find the normal vector determinant of the plane

How to use cross product to find the normal vector determinant of the plane

Suppose two known vectors are (x1, Y1, z1), (X2, Y2, Z2)
Then the normal vector is (y1z2-y2z1, z1x2-z2x1, x1y2-x2y1)
They are all crossed, multiplied and subtracted. Just remember the order