Contrary to popular belief, no, you cannot learn everything from the internet, especially if it’s a niche discipline. If you want to learn about something in depth you’re going to have to talk to people and read books and look at other ephemera and do some trial and erroring eventually.
This is why libraries are so important!
I certainly can’t afford to spend thousands of dollars tracking down obscure books just out of my random interest, but a lot of the time cities or universities will have them, which is so cool.