The Laws of witchcraft
Law of Contagion
Once two or more people or objects have been in contact with each other a magical link is created between them until a formal cleansing, consecration, exorcism or act of banishment breaks the non material bond.Law of Sympathy
Things which are similar or treated the same establish a sympathetic link and can affect each other.
law of Correspondence
Things look like what they are. "As above so below and all are the same but opposite."
Law of Equivalent Exchange
Everything has a price. Everything anyone does will be paid for even if they are not aware of it. And you can't gain anything without first giving something. If you give the seed you will get the harvest but if you roast the seeds and eat them you will get nothing.
Law of Reversal
What ever magic does magic can undo.
The Law of Balance
In the end everything balances out.
Law of backlash
(Related to a working of the harmful sort)
If the caster fails to do a spell right thier intention or worse may come back at them.
Law of karma
You create harm where none existed you get harm back where none existed although Karma is not always instant and might be deflected.
Law of choice
You do not owe anyone anything it is ultimately your choice to do a working in someone's favor whether you like it or not.
Law of Truths
There is no absolute truth for everything.
There are many more rules and laws of magic but this specific few I only pay heavy amount of attention too but if you would like further reading of more I suggest this link right here