Reddit mentions of The Anthropology of Religion, Magic, and Witchcraft (3rd Edition)

Here's a few pdfs about worldwide witchcraft beliefs:

Azande witchcraft this one's about the Azande idea of witches, which is a great exception from my review. Essentially they believe that witchcraft is inherited through the male line, is conducted through a substance produced by a special organ, can occur involuntarily, and is the ultimate cause of misfortune. I can't really do it the justice it deserves, seriously, check out the pdf.

Witchcraft in France witchcraft in western France, and its relationship with language.

Witchcraft in Sierra Leone you could build entire worlds off this one document. It talks about how the idea of an alternate witch's or spirit's world in Sierra Leone's folklore has evolved with modernization.

Besides these, I would recommend looking at cultural studies of less economically developed regions of the world like parts of sub-Saharan Africa, South-East Asia, or South America, those tend to touch on the complex and fascinating magical beliefs of those places. You can't go wrong researching kabbalah, a form of Jewish mysticism which formed the rich foundation of much of the Western magical tradition that wasn't taken from the Greeks. Some of the most interesting stuff on magic I've found has been squirreled away in a general source on a culture, like the magical rites of the mystery cults of Greece and the Roman Empire.

The internet is a wonderful tool for learning. Try to focus on academic articles though, such as by using Google scholar when you look up relevant topics.

Oh, and reddit itself can have a surprisingly reliable yet approachable academic body, depending on where you look. r/Anthopology, to give an example, is a treasure trove of great information for worldbuilding or otherwise.

The Anthropology of Magic, Religion, and Witchcraft (3rd Edition)