This is one of the most widely-known “black magick” acts due to movies and books - remember, many people come to this forum as total beginners in either magick as a whole, or at least, the “darker” arts, and what may seem “old hat” to some people here is new, fresh, exciting, and maybe a little frightening to them.
This is a beginner-friendly forum, and people are not in any way responsible for what someone else posted a few days or weeks ago.
Zeela has dropped in a link on this and that I hope covers the basics, if people have “sold their souls” and have specific methods they may of course begin an “I sold my soul and got (this lousy t-shirt)” etc as needed, to put their perspectives.
I have moved this topic to the New Magician Help category and encourage, nay actively request all TL3 members to use their moderation-like ability to move topics in this way.
And for your own benefit, you can MUTE an entire category, by going to the circle by the New Topic button and selecting it, so once you have moved the question there you will not be troubled by it again.