Thanks for this beautiful video, and it is true that not enough of us know enough about the angels to make good use of them, because we haven't been taught. However, in addition to this mavellous video there are many books about them. A few books published by TAN are: "The Guardian Angels - our Heavenly Companions", "St Raphael, The Angel of Marriage, of Healing, of Happy Meetings, of Joy and of Happiness", by Angela Carol, "St Michael and the Angels - compiled from approved sources", "Angels and Devils" by Joan Carroll Cruz. Also, to understand the evil angels and what they can and cannot do I recommend "The Devil - Does He Exist and What Does He Do?" by Fr Delaporte of the Society of Mercy.