For a long time I had imagine that the most advance human can do if we can learn and practice magic and other mysticism like we learn at schools like hogwarts while also interact and develop technology and science nowadays.
In this scenario, in our world nowadays some group of peoples manages to spread virally a ton of ancient knowledge of magic that can be practised by anyone and it really worked. Like any other things that spread on internet, the government late to contains it and it have already spread troughout the world.
Magic and mysticism right here ranging from elemental magic mastery, make astral projection of ourselves, necromancy, curses, to manage chakra, anti magic charms, basicly almost anything except time magic (while as a soul we can re-see the past, and catch a glimpse of possible future),and telekinesis are restricted to lifted what we can already lifted by our muscle, tough we can joined together to lifted more heavy items. (but yeah everybody can do the avatar element bending ability, light a stick, and do magic battle like harry potter, with proper trainings).
Learn magic will be like learn to drive. While simple task are able to be mastered by anyone (any functional human being can learn to sparks a fire with their fingers) some high magic needs to spent your lifetime to master, like necromancy, and you still can command a horde of zombies since it would need you to learn to control two or more bodies while you still just have one brain (No real ressurection magic, but there's advance healing knowledge).
Learn the magic is like learn to alter the 'code program' of the universe with our will. While spells and incantations helps, we do not really need it if we grasp its concept. And it is also affect to develop our perspective on physics. Our science and technology will also get a big leap, since we know our nature and metaphysics better.
The knowledge would also include a history of sentient beings before us, and also legendary creatures, tough we will immediately known that they are ceased to exist now. We still don't really know about how the universe created, and wether there's some advance alien life form still exist out there.
Telepathy also real, while you still can't easily do mind reading/ mind control since people at normal conditions with little practice can developed a subconscious 'wall defense' on such attacks.
Teleportation knowledge is there, but no human could do it.
While it is difficult we can learn transmutation, and law of equivalent change still apply. Thus you need more than water to turn it to wine.
How do you think we would react on 1-2 decades after this knowledge went to public? How will our society changes and what effect it would have on our norm and technology?
While it can solve numerous nowadays problem, it would brought new problems to us. What is the possible scenario in more advance technological and magic civilization in the future (say 50-100 years from now), that all of this will guide our species to our own extinction (no aliens, gods-demigods, or mystical creatures involved)?