If you want to gain something (friendship, money, intelligence, job,) do your your magick during the Waxing moon. This is the time of new beginnings, when one project ends and another begins. The waxing moon is the best time to do a spell for growth, and initiation. The virgin aspect of the goddess would be used for invocation, chants, and prayers. This is the time for bringing positive works and energies.
The Waning moon is the ideal time for banishing negative influences, remove obstacles and illness, study, and meditation. The crone aspect of the Goddess watches over us at this time. During this time your walking the knife edge. Half light, Half Dark, good time for decisions. Balance carefully. Continue regeneration and renewal.
The Full Moon or the "Moon of Celebration" is a good time for magick of all kinds, for the Full Moon brings great power to all magick. The Full Moon is the time we set aside for the worship of the Goddess in her Mother aspect. Remember that even though the moon Looks full in the sky for two or three nights , it is only full at the time posted. Do your Full Moon spell or ritual before the posted time.
The New Moon is a soothing time of rest and planning for new beginnings. It is a time for banishing and nuetralizing spells. It can be a starting point for kicking that bad habit, or simply beginning a project. It is a time when one can explore thing that they do not understand. Try to set new goals and review old one made.