There are a few laws and rules attributed to Wicca and Witchcraft that I believe everyone should know. While not to be held in the strictest sense I do feel however that they will usefully guide your abilities in a more positive manner for you and those around you.
At first glance one would assume that this meant that you could do anything you wanted as long as it doesn't harm another person. However it also means that you should never harm yourself as well. But it also doesn't mean that you should ignore people who are out to harm you as there are other ways to deal with such people. For example you could use a spell of protection on yourself to deflect harm. And it can be seen that the 'Three-Fold Law of Return' then reinforces this rule.
While I don't understand exactly were the number three came from (maybe someone would like to tell me) but basically what this is saying is that for every action there is always an equal and opposite reaction. And you should always be aware of all the implictions that this law holds.
The Power shall not be used to bring harm, to injure or control others. But if the need rises, the Power shall be used to protect your life or the lives of others.The Power is used only as need dictates.
The Power can be used for your own gain, as long as by doing so you harm none.
It is unwise to accept money for use of the Power, for it quickly controls its taker. Be not as those of other religions.
Use not the Power for prideful gain, for such cheapens the mysteries of Wicca and magick.
Ever remember that the Power is the sacred gift of the Goddess and God, and should never be misused or abused.
We are of the Old Ways, among those who walk with the Goddess and God and receive Their love.Keep the Sabbats and Esbats to the best of your abilities, for to do otherwise is to lessen your connection with the Goddess and God.
Harm none. This, the oldest law, is not open to interpretation or change.
Shed not blood in ritual; the Goddess and God need not blood to be duly worshipped.
Those of our ways are kind to all creatures, for hurtful thoughts are quiet draining and aren't worth the loss of energy.
Misery is self-created; so, too, is joy, so create joy and disdain misery and unhappiness. And this is within your power. So harm not.
Teach only what you know, to the best of your ability, to those students who you choose, but teach not to those who would use your instructions for destruction or control. Also, teach not to boost pride, forever remember: She who teaches out of love shall be enfolded in the arms of the Goddess and God.
Ever remember that if you would be of our way, keep the law close to your heart, for it is the nature of the Wicca to keep the Law.
If ever the need arises, any law may be changed or discarded, and new laws written to replace them, so long as the new laws don't break the oldest law of all: Harm None.