The 72 angels of the Shem Hamephorash are derived from an ancient Jewish tradition that assigns a specific name and purpose to each of the 72 letters in the Hebrew name for God (Source), known as the Tetragrammaton. These angels are believed to hold immense power and serve as intermediaries between humans and the divine.
The 72 Angels of Shem HaMephorash are opposite to the 72 Demons of Goetia from a polarity standpoint. They both play their roles in the divine balance of the universe. Working with each angel within this book can activate different parts of yourself and begin to move energy in a certain direction. The angels have the ability to activate parts of your conscious mind, while demonic forces typically can activate aspects of your subconscious mind. Each aspect revolves around who you are as a person. Working with any of these forces will trigger change within your life and slowly get you closer to your most authentic self. That does not come without challenges. Invoking any spirit, angelic or demonic, should be done with respect for the spirit and respect for yourself.