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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)

Nearly 30 years ago, I read a book, Wizard's Bane, by Rick Cook. The magical system was so logical that the protagonist learns to use it much like a programming language--writing magical subroutines, etc.

I really enjoyed it.

I think you might like the magic system in The Cradle Series. It has a relatively soft magic system where people harness different types of auras which form in the natural world and mix and use them in thousands of different styles. For instance the protagonist is from a clan who specializes in using dream and light aura to craft illusions while another person uses sharpness aura to make other people's weapons explode with invisible knives.

I'd recommend picking up a copy of Isaac Bonewits' Real Magic. He goes into some detail about applying science to the study of magic, including psychokinesis. You might also, if you're incredibly curious, pick up his gaming supplement Authentic Thaumaturgy, but I've always gotten more gaming and magic system design use out of the former than the latter.

https://www.amazon.com/Game-Magic-Designers-Systems-Practice/dp/1466567856/ref=sr_1_sc_2?ie=UTF8&qid=1474059905&sr=8-2-spell&keywords=gamemagic

See Mistborn by Brandon Sanderson - https://www.amazon.com/Mistborn-Final-Empire-Book-No/dp/0765350386