How to judge the positive and negative moment?

How to judge the positive and negative moment?

M=F·L
The moment of a force on an axis is the physical quantity that the force acts on an object to rotate around an axis. It is an algebraic quantity, and its magnitude is equal to the product of the component force of the force on the plane perpendicular to the axis and the vertical distance from the action line of the component force to the axis. Its sign is used to distinguish the different turns of the moment. It is determined according to the right-hand screw rule: make a fist with the four fingers of the right hand along the direction of the component force and the palm facing the axis of rotation, If the direction of thumb is consistent with the positive direction of the axis, a positive sign will be taken; otherwise, a negative sign will be taken