Smooth rotation unity

Vector3 targetRotation = path[i].transform.position - transform.position;
transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(targetRotation), 4f * Time.deltaTime);
//LookRotation points the positive 'Z' side of an object in a specified direction
//FromToRotation creates a rotation that from one direction to another direction

Unity smooth rotation 2d

 float targetAngle = 90;
 float turnSpeed = 5;
 transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.Euler (0, 0, targetAngle), turnSpeed * Time.deltaTime);

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