how to use unity lists code example

Example 1: unity list

GameObject Obj;
List<GameObject> Objects = new List<GameObject>();

Objects.Add(Obj);

Example 2: unity list

GameObject Obj;
List<GameObject> Objects = new List<GameObject>();

Objects.Add(Obj);
Objects.remove(Obj);,
Objects.Insert(0,Obj);
Objects.RemoveAt(0);