3d movement with camera in unity code example

Example: how to code a move camera in unity

void Update()
 {
     if(Input.GetKey(KeyCode.RightArrow))
     {
         transform.Translate(new Vector3(speed * Time.deltaTime,0,0));
     }
     if(Input.GetKey(KeyCode.LeftArrow))
     {
         transform.Translate(new Vector3(-speed * Time.deltaTime,0,0));
     }
     if(Input.GetKey(KeyCode.DownArrow))
     {
         transform.Translate(new Vector3(0,-speed * Time.deltaTime,0));
     }
     if(Input.GetKey(KeyCode.UpArrow))
     {
         transform.Translate(new Vector3(0,speed * Time.deltaTime,0));
     }
 }