Learn
For many people, the best way to learn something is while interacting with an experienced and attentive mentor. University courses, whether on campus or online are the "go-to" for that opportunity. Not everyone can afford the time or the expense to manage a class schedule. Here are some recommended alternatives.
Do you want to teach yourself neuroscience?
The following resources are all completely free and available online.
Neuroscience Online, an Open-Access Neuroscience Electronic Textbook