Check out example codes for "freeze axis in script". It will help you in understanding the concepts better.

Code Example 1

public Rigidbody2D rb;

void Start()
{
	//Freeze Rotation on X Axis
	rb.constraints = RigidbodyConstraints2D.FreezeRotationX;
    //Freeze Rotation on Y Axis
    rb.constraints = RigidbodyConstraints2D.FreezeRotationY;
    //Freeze Rotation on Z Axis
    rb.constraints = RigidbodyConstraints2D.FreezeRotationZ;

	//Freeze Position on X Axis
	rb.constraints = RigidbodyConstraints2D.FreezePositionX;
    //Freeze Position on Y Axis
	rb.constraints = RigidbodyConstraints2D.FreezePositionY;
    //Freeze Position on Z Axis
	rb.constraints = RigidbodyConstraints2D.FreezePositionZ;
  
    //Freeze All Axis (Rotation & Position)
    rb.constraints = RigidbodyConstraints2D.FreezeAll;
    //UnFreeze All Axis (Rotation & Position)
    rb.constraints = RigidbodyConstraints2D.None;
}

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