Welcome to Spells of Magic, this site hold a variety of information. Witchcraft as you know is a old practice that dates back before medieval days. Witchcraft as you know doesn't really fit into any religions, this is because Witchcraft can be a little apart of any religion.
You can find many things about "Witchcraft" and its roots, you can ask around to our knowledgable members. Now since you want to learn about magick, I would suggest you to read up. Magick isn't like Hollywood, magick can't make apples appear out of no where, or stop a bullet, or teleport you anywhere.
Magick has laws in which are not placed on us by people, these laws are from the Universe. There are some people out there compeled to see if they can break these physical boundries, but they can't.
Now, learning more on the subject you are wanting to know, doesn't have to be online reading, you can buy books. You can find some information online, especially on this site, you can check our "Articles" or "Forums", or you can participate in our open chat (but first, if you haven't, complete the chat rules agreements, read carefully).