I've found that the internet is fantastic for compiling information or checking a concept or two, but isn't very useful for learning swathes of material. I lear

I've found that the internet is fantastic for compiling information or checking a concept or two, but isn't very useful for learning swathes of material. I learn mostly from used textbooks, which can often be found on sites like abebooks.com or http://gen.lib.rus.ec/ http://gen.lib.rus.ec/ Pick a book that seems interesting and work through it. You don't have to be religious about following their topics or order though.