[Noseshine]

Free excellent courses:

Start with "Fundamentals of Neuroscience" by Harvard, free multimedia course that requires only a high school level education:

https://www.mcb80x.org/

then go to

"Medical Neuroscience" on Coursera (the professor is a great teacher):

https://www.coursera.org/learn/medical-neuroscience

Especially the 2nd course is pretty big, on of the largest online courses there is in terms of videos to watch and things to learn. But while it is a lot it is much easier than the quantum mechanics course(s) half the size on edX. You don't have to think much, just listen and learn.

Aft hat you have a very solid foundation, now check out more such courses on the same platform.