Check out example codes for "how to randomly rotate rigidbody of object in unity". It will help you in understanding the concepts better.

Code Example 1

public float speed; private Rigidbody2D rigidbody2d;  void Start() {     rigidbody2d = GetComponent<Rigidbody2D>();     rigidbody2d.angularVelocity = Random.value * speed; }

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