There are many books on black magic on amazon and they have reviews of people saying they followed the book and they managed to get a hot girl, money, health or whatever.
But when I use those books nothing happens? Why can't my black magic work? Why oh why?
I'll tell you a secret about all of this esotericism shit.
It's not the content of the book that matters, even the prayers or the rituals described. You could follow them to the letter and see no results. It doesn't even matter which deity you choose to worship, which rituals and in what order you perform them. Fuck you could even make up your own rituals, or your own deity, or believe in none at all.
What matters is how you visualize it in your head.
There are levels to visualizations and believes, I could only ever go to the surface levels of my mind and even there I dwelled quite deep but there is just so much more and so much depth in our minds unexplored its unreal, our subconscious psyche really is a sea of wonder and terror and most only ever get to swim on the surface of it while that sea goes miles deep. Psychedelics can be a nice shortcut to cut through to some of those deeper level for a while, but that is more of a tourism than a lifecycle.
If you want to see results from your esoteric activities, like the black magic books or any other bullshit rituals you follow, then you will have to put in a lot of work to make that happen and even then the results are probably not really what you would expect anyway, I don't know much of an influence we can really have on our reality, you'll probably find that you'll be able to anticipate things and predict certain outcomes and know what to do to reach those goals instead of them coming to you directly. But anyway it takes a lot of work to get to those stages and it really doesn't matter what you use to visualize it, you can do whatever you want, you can start believing in a moon unicorn cult for all you care it makes no difference on the end outcome as long as you can break through your mind barriers to those deeper subconscious levels you can believe whatever you want to help you get there. It's just most people find it easier to believe in things like black magic or other more established esoteric believes because they feel more grounded. It really isn't all that much different from praying to God in a Christian church etc.