The new moon symbolizes a rebirth. Some magicians believe that you should not practice magic at the new moon, but wait until the moon is growing. Time at the new moon can be conveniently used to gather strength and inspiration for your continued magical work. This phase promotes new beginnings.
The increasing moon is when it goes from new moon to full moon. During this time the forces are rising and the attraction of the moon affects everything exposed to its energy. This phase promotes creativity and development.
The full moon is the perfection of all the moon phases. It attracts us with a restless energy, and some people can get pretty difficult at this time. The full moon can cause insomnia, intense dreams and irritation. This time is suitable for any kind of magic, because of the strong forces and it's a phase which promotes closures.
Time at the waning moon, is also suitable for magic if you want to get rid of something. Removing warts, lose weight or quit a relationship is easiest at this time. Your energy turns inward, and you can more easily process the experiences. Together with the full moon it's a phase to release what no longer serves us.