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Quantum physics. But I'm at a stage where I actually would have to really start learning. YouTube videos don't cut it anymore. I would have to actually understand the maths and my brain can't handle that at the moment.
Same for me
You’d have to start with linear algebra and differential equations if you want to grasp it.
Use IBM's cloud quantum computers to learn a bit, you can indeed find YouTube videos that explain to you how to do the calculations and then you can just play around making algorithms on their systems and verifying that you can do the calculations correctly. With that knowledge alone you can then begin to learn how to step through a lot of the famous experiments that all purport to show the strangeness of quantum mechanics, like Bell's theorem, the "bomb tester" thought experiment, GHZ experiment, quantum teleportation, etc, as most of the famous ones can be implemented on a quantum computer and you can get an understanding of why they are interesting.