Moon phases really effect your spell casting. Spells have their own moon phase, but all kinds of spells can be cast on full moon.
New Moon
The dark of the moon, when the moon is invisible or the new moon itself,is the most affective for casting spells concerning New Beginnings, and the launch of new projects. It is generally a time for taking new paths and making fresh plans established on the basis of past experiences. The influence of the New moon can also boost ambitions and careers, so it is a productive time for sowing the seeds of success. During the New moon, money spells, and work spells stand a better chance of being fulfilled than at other times. It is generally a good time for spending money and speculating with a view towards the future. Those who have experienced problems should take advantage of the valuable time to back hunches await success.
Waxing Moon
The waxing moon is the period between the New moon and Full moon. This is a special time for expansion and growth, and accumulating strength. It is also an appropriate time for preparing your magical spells for the most promising time, which is the three days before the moon is full. The waxing moon aids the accomplishment of any undertakings, whether of a practical or spiritual nature. It is time for witches?? quests for empowerment and a period in which to enhance our magical powers and our perception of the other world. In fact, the closer we come to the Full moon, the stronger and more aspiring are our intuitive powers, which in turn, leads to a new level of awareness.
Full Moon
The Full moon is the most fortuous time, especially when it??s approaching the witching hour of midnight. Your inner strength and magical powers will be at their peak. Casting love spells during the Full moon assures enchanting outcomes, so if you yearn for more love in your life, now is the time to transcend your desires into the cosmos. The full moon is also the most appropriate time to give recognition and to pay tribute to the spirits that guide and protect you. During this period, the extrovert aspects of our character begin to appear more outgoing and receptive towards others. So use this time wisely and crystallize your spells into rewarding experiences.
Waning Moon
This is the period when the moon journeys from Full to New moon. Casting spells for removing problems, eliminating trouble and neutralizing adversaries and harm is most affective when the moon is on the wane. Protection spells for yourself, your loved ones, home and material possessions are also best cast. It is also a good time when our bodies are most susceptible to cleansing, so it is a good time to cleanse yourself through the process of detoxification. This can be best achieved through healing and herbal remedies, such as healing teas, diet and exercise also become easier and results last longer.
To begin with, I believe that someone hasn't cited their source (the person who gave the previous answer). Citing your sources is a very important thing so I'll do that for you at that time:
You can cast your spells whenever you want, without following and listening to what astrology teaches you about proper planetary hours and days for casting any category of spells.
Casting your spells according to planetary hours and days is only optional, so your spells will work just as it does in recommended days if you know how to cast it and perform it.
Just like moon phases, tools and ritual supplies, chanting and circles, casting your spells according to specific planetary hours and days, that is only optional , so you can do what you will. It means that everything will be fine if you do not follow this optional step. You have many options in magic, many of them are not necessary at all, just as following astrological /planetary days or hours/ symbolism and all of the other optional list of criterions I've listed here.
Planetary hours and days and moon phases by all meanings basically serve a symbolic value which comes from symbolism and sometimes astrology and focuses on different things symbolically, which you choose if to follow or not.
What you do need to necessarily follow while casting your spell is raising and building up energy, directing it for a specific intent / desire, which is basically the idea of spell casting and how it generally works, without any optional additions and steps ( which are helpful by the way).
Do what you will in your spells and follow whatever steps you wish to follow. Just remember how spells work and how you're doing it.
Also, after I cited the above poster's source, it gives you the exact symbolic meaning of the moon phases (included in the article). I hope it helps.
