How to judge the positive and negative moment with the right-hand spiral rule in University Mechanics?

Torque is a vector, not an algebraic quantity. It is defined as the vector product of displacement and force vector. The direction of torque is determined by vector algorithm, that is, when the bending direction of the four fingers of the right hand turns from the displacement direction to the force vector along the angle direction less than 180 degrees, if this direction is the same as the assumed positive direction, it is recorded as positive

How to judge the positive and negative moment?!

How to judge the positive and negative of resultant moment
This is a simply supported beam, not a shaft that cannot be rotated

Clockwise is positive and the opposite is negative
You can also press the direction of the force, the left side up and the right side down are positive, the opposite is negative

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How to judge the positive and negative moment with the right-hand spiral rule in University Mechanics?