It is a loaded question and i will try to give a brief answer.
It is a known fact that our earth contains 2 dimensions, the one you see and the one you do not see, unless you have disciplined your live and refrained from certain foods and activities.
Now, it is possible to have and acquire knowledge of herbs and incantations and when applied properly, can get very real results. But be careful what you wish for.
Yes, the occult world is open to all and what you get out of it depends on how good you follow the rules of nature. Some might call it witchcraft, voodoo, satanism, Santeria etc but they all try to draw power from the same source "NATURE"
But do remember that the true powerful ones in any of the dark acts are very few indeed. 97% of practitioners have no power or clue and just prey on innocent people looking for quick solutions to problems that are clearly self inflicted.
If you so desire, you can get natural powers, but people will fear and might run from you because once in, you become different.